0001437749-21-012120 | 10-Q | XBRL Viewer

Earnings Per Share [Text Block]

Earnings Per Share

Basic earnings (loss) per sha

re is computed by dividing the net loss for the period by the weighted-average number of common shares outstanding during the period. Diluted earnings (loss) per share (“EPS”) includes the dilutive effect of common stock equivalents and is computed using the weighted-average number of common stock and common stock equivalents outstanding during the reporting period. Diluted EPS for the

three

months ended

March 31, 2021

and

2020

excluded common stock equivalents because the effect of their inclusion would be anti-dilutive or would decrease the reported loss per share.

The following table sets forth securities outstanding that could potentially dilute the calculation of diluted earnings per share:

	Three Months Ended March 31,
	2021		2020

Warrants to purchase common stock - liability classified		56,735		54,669
Warrant to purchase common stock - equity classified		94,108		—
Conversion of 2020/21 Notes		—		6,713,817
Outstanding options to purchase common stock		1,517		1,561
Stock appreciation rights		67,739		67,739

Total		220,099		6,837,786

Note 3 - Revenues From Contracts With Customers and Other Revenues

3 Months Ended

Mar. 31, 2021

Revenue from Contract with Customer [Text Block]

Revenues from Contracts with Customers and Other Revenues

The Company's current and historical revenues have consisted of the following: (a) hydrocarbon revenue; (b) ethanol sales and related products revenue, net; and (c) grant and other revenue, which primarily has historically consisted of revenues from governmental and cooperative research grants.

Hydrocarbon revenue.

Hydrocarbon revenues include sales of SAF, isooctene and isooctane and are sold mostly on a free-on-board, shipping point basis. Each transaction occurs independent of any other sale, and once sold, there are

future obligations on the part of the Company to provide post-sale support or promises to deliver future goods or services.

Ethanol sales and related products revenues.

Ethanol sales and related products revenues are sold to customers on a free-on-board, shipping point basis. Revenue is recognized when the customer has control of the product. Each transaction occurs independent of any other sale, and once sold, there are

future obligations on the part of the Company to provide post-sale support or promises to deliver future goods or services.

Grant and other revenues.

Grant revenues have historically consisted of governmental and cooperative research grants. Other revenues have historically included occasional short-term (less than

one

-year) consulting services and leases of certain storage facilities located at the Luverne Facility.

The following table sets forth the components of the Company's revenues between those generated from contracts with customers and those generated from arrangements that do

not

constitute a contract with a customer (in thousands):

	Three Months Ended March 31, 2021
Major Goods/Service Line	Revenues from Contracts with Customers		Other Revenues		Total

Hydrocarbon revenue	$	13	$	—	$	13
Other revenue		—		80		80

	$	13	$	80	$	93
Timing of Revenue Recognition
Goods transferred at a point in time	$	13	$	—	$	13
Services transferred over time		—		80		80

	$	13	$	80	$	93

	Three Months Ended March 31, 2020
Major Goods/Service Line	Revenues from Contracts with Customers		Other Revenues		Total

Ethanol sales and related products, net	$	3,700	$	—	$	3,700
Hydrocarbon revenue		125		—		125

	$	3,825	$	—	$	3,825
Timing of Revenue Recognition
Goods transferred at a point in time	$	3,825	$	—	$	3,825
Services transferred over time		—		—		—

	$	3,825	$	—	$	3,825

Goods transferred at a point-in-time.

For the

three

months ended

March 31, 2021

and

2020,

there were

contracts with customers for which consideration was variable or for which there were multiple performance obligations for any given contract. Accordingly, the entire transaction price is allocated to the goods transferred. As of

March 31, 2021

and

December 31, 2020,

there were

remaining unfulfilled or partially fulfilled performance obligations.

All goods transferred are tested to ensure product sold satisfies contractual product specifications prior to transfer. The customer obtains control of the goods when title and risk of loss for the goods has transferred, which in most cases is “

free-on-board, shipping point

”. All material contracts have payment terms of between

one

three

months and there are

return or refund rights.

Services transferred over time.

For the

three

months ended

March 31, 2021

and

2020,

there were

contracts for which consideration was variable or for which there were multiple performance obligation for any given contract. Accordingly, the entire transaction price is allocated to the individual service performance obligation. As of

March 31, 2021

and

December 31, 2020,

respectively, there were

material unfulfilled or partially fulfilled performance obligations.

Contract Assets and Trade Receivables.

As of

March 31, 2021

and

December 31, 2020,

there were

contract assets or liabilities as all customer amounts owed to the Company are unconditional and the Company does

not

receive payment in advance for its products. Accordingly, amounts owed by customers are classified as account receivables on the Company's Consolidated Balance Sheets. In addition, due to the nature of the Company's contracts, there are

costs incurred or to be paid in the future that qualify for asset recognition as a cost to fulfill or obtain a contract as of

March 31, 2021

and

December 31, 2020.

The Company did

not

incur any impairment losses on any receivables as all amounts owed were paid or current as of

March 31, 2021

December 31, 2020.

The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts.

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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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Reference 10: http://www.xbrl.org/2003/role/disclosureRef
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Note 4 - Leases, Right-to-use Assets and Related Liabilities

3 Months Ended

Mar. 31, 2021

Lessee, Operating Leases [Text Block]

Leases, Right-to-Use Assets and Related Liabilities

The contracts for the Company are comprised of facility and equipment leases necessary to conduct the Company's day-to-day operations for which the Company maintains control of right-to-use assets and incurs the related liabilities. Right-of-use assets totaling

$1.7

million are included in "Deposits and other assets," and

$1.9

million of lease liabilities are included in "Other long-term liabilities" in the Consolidated Balance Sheets, respectively, as of

March 31, 2021.

The Company has

two

lease agreements that qualify as “operating” based on the terms and conditions at the commencement date for each lease. The

first

lease is for the Company's office and research facility in Englewood, Colorado, which expires in

January 2029,

and includes monthly charges for common area and maintenance charges. The

second

lease is for equipment. All other leases qualified for the short-term scope exemption.

The Company recognizes rent expense on its operating leases on a straight-line basis.

The Company began leasing its grain bins in Luverne, Minnesota in

October 2020

through a short-term operating lease agreement which expires in

July 2021.

Rental income for the

three

months ended

March 31, 2021

totaled

$0.1

million.

The following table presents the (a) costs by lease category and (b) other quantitative information relating to the Company's leases (dollars in thousands):

	Three Months Ended March 31,
	2021			2020
Lease Cost
Financing lease cost	$	11		$	1
Operating lease cost		61			471
Short-Term lease cost		132			80
Variable lease cost (1)		39			32

Total lease cost	$	243		$	584

(1) Represents amounts incurred in excess of minimum payments for common area maintenance and present value discounts

	Three Months Ended March 31,
	2021			2020
Other Information
Cash paid for the measurement of lease liabilities:
Operating cash flows from finance lease	$	6		$	1
Operating cash flows from operating leases		61			471
Finance cash flows from finance lease		7			—
Right-to-use asset obtained in exchange for new financing lease liability		—			13
Right-to-use asset obtained in exchange for new operating lease liability		1,562
Weighted-average remaining lease term, financing lease (months)		221			59
Weighted-average remaining lease term, operating leases (months)		94			18
Weighted-average discount rate - financing lease (2)		13	%		21	%
Weighted-average discount rate - operating leases (3)		5	%		12	%

(2) The discount rate used for the finance lease was based on the rate implicit in the lease.
(3) The discount rate used for operating leases is based on our implicit borrowing rate at the date the Company entered into the lease.

The table below shows the future minimum payments under non-cancelable financing and operating leases at

March 31, 2021 (

in thousands):

Year Ending December 31,	Operating Leases			Financing Leases

2021 (remaining)	$	103		$	25
2022		24			26
2023		297			26
2024		305			26
2025		1,042			22
2026 and thereafter		1,030			301
Total		2,801			426
Less: Amounts representing present value discounts		(1,138	)	(263		)

Total lease liabilities	$	1,663		$	163

March 29, 2021,

Gevo signed a

first

amendment to a land lease agreement in northwest Iowa dated

January 7, 2020.

The lease term is for

years after the digester facility becomes operational, estimated to occur in

December 2021.

Note 5 - Inventories

3 Months Ended

Mar. 31, 2021

Inventory Disclosure [Text Block]

Inventories

The following table sets forth the components of the Company's inventory balances (in thousands):

	March 31,		December 31,
	2021		2020
Raw materials
Enzymes and other inputs	$	121	$	133
Nutrients		1		1
Finished goods
SAF, Isooctane and Isooctene		725		756
Work in process
Gevo		5		5
Palladium		235		235
Spare parts		1,365		1,361

Total inventories	$	2,452	$	2,491

Work in process inventory includes unfinished SAF, isooctane and isooctene inventory.

Note 6 - Property, Plant and Equipment

3 Months Ended

Mar. 31, 2021

Property, Plant and Equipment Disclosure [Text Block]

Property, Plant and Equipment

The following table sets forth the Company's property, plant and equipment by classification (in thousands):

	Useful Life		March 31,			December 31,
	(in years)		2021			2020

Luverne retrofit asset		20	$	70,820		$	70,820
Plant machinery and equipment		10		17,374			17,374
Site improvements		10		7,157			7,157
Lab equipment, furniture and fixtures and vehicles		5		6,396			6,396
Demonstration plant		2		3,597			3,597
Buildings		10		2,543			2,543
Leasehold improvements, pilot plant, land and support equipment		2 to 5		2,523			2,523
Computer, office equipment and software		3 to 6		2,021			1,983
Construction in progress		—		18,525			13,132

Total property, plant and equipment				130,956			125,525
Less accumulated depreciation and amortization				(60,260	)		(59,117	)

Property, plant and equipment, net			$	70,696		$	66,408

The Company recorded depreciation and amortization expense related to property, plant and equipment as follows (in thousands):

	Three Months Ended March 31 ,
	2021		2020

Cost of goods sold	$	1,088	$	1,587
Operating expenses		56		56

Total depreciation and amortization	$	1,144	$	1,643

Note 7 - Embedded Derivatives Liabilities

3 Months Ended

Mar. 31, 2021

Discussion of Hybrid Instruments and Embedded Derivatives [Text Block]

Embedded Derivatives Liabilities

Derivative Warrant Liability

There were

warrants sold by the Company during the

three

months ended

March 31, 2021.

The following table sets forth information pertaining to shares issued upon the exercise of warrants as of

March 31, 2021:

	Issuance Date	Expiration Date	Exercise Price as of March 31, 2021		Shares Underlying Warrants on Issuance Date	Shares Issued upon Warrant Exercises as of March 31, 2021	Shares Underlying Warrants Outstanding as of March 31, 2021

Series F Warrants	04/01/2016	04/01/2021	$	40.00	25,733	11,692	14,041
Series I Warrants	09/13/2016	09/13/2021	$	220.00	35,368	—	35,368
Series K Warrants	02/17/2017	2/17/2022	$	2.00	315,986	308,660	7,326
Series 2020-A Warrants (1)	7/6/2020	7/6/2025	$	0.60	30,000,000	29,905,892	94,108

					30,377,087	30,226,244	150,843

(

) The Series

2020

-A Warrants are equity-classified warrants.

The agreements governing the above warrants include the following terms:

•

certain warrants have exercise prices which are subject to adjustment for certain events, including the issuance of stock dividends on the Company's common stock and, in certain instances, the issuance of the Company's common stock or instruments convertible into the Company's common stock at a price per share less than the exercise price of the respective warrants;

•

warrant holders

may

exercise the warrants through a cashless exercise if, and only if, the Company does

not

have an effective registration statement then available for the issuance of the shares of its common stock. If an effective registration statement is available for the issuance of its common stock a holder

may

only exercise the warrants through a cash exercise;

•

the exercise price and the number and type of securities purchasable upon exercise of the warrants are subject to adjustment upon certain corporate events, including certain combinations, consolidations, liquidations, mergers, recapitalizations, reclassifications, reorganizations, stock dividends and stock splits, a sale of all or substantially all of the Company's assets and certain other events; and

•

in the event of an “extraordinary transaction” or a “fundamental transaction” (as such terms are defined in the respective warrant agreements), generally including any merger with or into another entity, sale of all or substantially all of the Company's assets, tender offer or exchange offer, or reclassification of its common stock, in which the successor entity (as defined in the respective warrant agreements) that assumes the successor entity is

not

a publicly traded company, the Company or any successor entity will pay the warrant holder, at such holder's option, exercisable at any time concurrently with or within

days after the consummation of the extraordinary transaction or fundamental transaction, an amount of cash equal to the value of such holder's warrants as determined in accordance with the Black-Scholes option pricing model and the terms of the respective warrant agreement. In some circumstances, the Company or successor entity

may

be obligated to make such payments regardless of whether the successor entity that assumes the warrants is a publicly traded company.

During the

three

months ended

March 31, 2021,

common stock was issued as a result of exercise of warrants as shown below (dollars in thousands):

	Common Stock Issued		Proceeds

Series 2020-A Warrants		1,863,058	$	1,117

Note 8 - Accounts Payable and Accrued Liabilities

3 Months Ended

Mar. 31, 2021

Accounts Payable and Accrued Liabilities Disclosure [Text Block]

Accounts Payable and Accrued Liabilities

The following table sets forth the components of the Company's accounts payable and accrued liabilities in the consolidated balance sheets (in thousands):

	March 31,		December 31,
	2021		2020

Accrued employee compensation	$	1,677	$	1,960
Accounts payable - trade		3,841		897
Accrued utilities and supplies		58		5
Other accrued liabilities		4,134		1,263

Total accounts payable and accrued liabilities	$	9,710	$	4,125

Note 9 - Debt

3 Months Ended

Mar. 31, 2021

Debt Disclosure [Text Block]

Debt

Loans Payable - Other

The equipment loans are secured by the related equipment.

April 2020,

the Company and Agri-Energy each entered into a loan agreement with Live Oak Banking Company, pursuant to which the Company and Agri-Energy obtained loans from the Small Business Administration's Paycheck Protection Program (“SBA PPP”) totaling

$1.0

million in the aggregate (the "SBA Loans"). The SBA Loans are subject to the potential for partial or full loan forgiveness as dictated by U.S. federal law. Principal and interest are deferred until

August 2021

and interest continues to accrue during the deferral period. The SBA Loans are payable monthly beginning

August 5, 2021,

with aggregate payments totaling

$0.06

million per month, including interest and principal. The SBA Loans are subject to partial or full forgiveness for the initial

-week period following the loan disbursement if all proceeds are used for eligible purposes and within certain thresholds, the Company maintains certain employment levels and the Company maintains certain compensation levels.

The balance of these loans at

March 31, 2021

and

December 31, 2020

are as follows (in thousands):

	Interest Rate	Maturity Date	March 31 , 2021			December 31, 2020

SBA Loans	1%	April 2025	$	1,006		$	1,006
Equipment	4% - 5%	October 2021 - December 2024		222			248

Total notes payable - other				1,228			1,254
Less current portion				(1,016	)		(807	)

Long-term portion			$	212		$	447

Future payments for Loans Payable - Other are as follows (in thousands):

Year ending December 31,

2021 (remaining)	$	778
2022		356
2023		62
2024		32

	$	1,228

April 15, 2021,

the Small Business Administration forgave the entire balance of

$0.5

million of the Company's and

$0.1

million of Agri-Energy's loans and accrued interest obtained through the SBA PPP. The remaining SBA PPP loan for Agri-Energy totals

$0.4

million, bears interest at

1.0%

and matures in

April 2025.

Monthly payments of

thousand begin on

June 5, 2021

and are payable through

April 2025.

Note 10 - Equity Incentive Plans

3 Months Ended

Mar. 31, 2021

Stock Incentive Plans Disclosure [Text Block]

. Equity Incentive Plans

2010

Stock Incentive Plan

. In

February 2011,

the Company's stockholders approved the Gevo, Inc.

2010

Stock Incentive Plan (as amended and restated to date, the

"2010

Plan"). The

2010

Plan provided for the grant of non-qualified stock options, incentive stock options, stock appreciation rights, restricted stock awards, restricted stock units and other equity awards to employees and directors of the Company. On

June 3, 2020,

the

2010

Plan was amended and restated, which increased the number of shares of common stock reserved for issuance to a total of

6,980,074

shares.

Restricted common stock activity during the

three

months ended

March 31, 2021

consisted of the following:

•

During the

three

months ended

March 31, 2021,

the Company cancelled

121,466

shares of common stock related to the vested restricted stock awards due to the resignation of a director.

March 31, 2021,

1,351,858

shares remain available for awards under the

2010

Plan.

Employee Stock Purchase Plan

. In

February 2011,

the Company's stockholders approved the Employee Stock Purchase Plan (the "ESPP"). The offering periods for the ESPP are from

January 1

June 30

and from

July 1

December 31

of each calendar year. The Company has reserved

190

shares of common stock for issuance under the ESPP, of which

190

shares as of

March 31, 2021

are available for future issuance. The purchase price of the common stock under the ESPP is

85%

of the lower of the fair market value of a share of common stock on the

first

or last day of the purchase period. There were

purchases of common stock under the ESPP during the

three

months ended

March 31, 2021

2020.

Note 11 - Stock-based Compensation

3 Months Ended

Mar. 31, 2021

Share-based Payment Arrangement [Text Block]

11.

Stock-Based Compensation

Stock-Based Compensation Expense

. The Company records stock-based compensation expense during the requisite service period for share-based payment awards granted to employees and non-employees.

The following table sets forth the Company's stock-based compensation expense (in thousands) for the periods indicated:

	Three Months Ended March 31,
	2021		2020
Restricted stock
Research and development	$	125	$	76
Selling, general and administrative		437		260

Stock appreciation rights
Research and development		348		(79	)
Selling, general and administrative		15		(85	)

Total stock-based compensation	$	925	$	172

Stock Option Award Activity

. Stock option activity under the Company's stock incentive plans at

March 31, 2021

and changes during the

three

months ended

March 31, 2021

were as follows:

					Weighted-
					Average
			Weighted-		Remaining
			Average		Contractual	Aggregate
	Number of		Exercise		Term	Intrinsic
	Options		Price (1)		(years)	Value

Options outstanding at December 31, 2020	1,552		$	556.13	5.58	$	—
Granted	—		$	—
Canceled or forfeited	(35	)	$	876.00
Exercised	—		$	—

Options outstanding at March 31, 2021	1,517		$	548.75	5.36	$	—

Options exercisable at March 31, 2021	1,517		$	548.75	5.36	$	—

Options vested and expected to vest at March 31, 2021	1,517		$	548.75	5.36	$	—

(

) Exercise price of options outstanding range from

$20

$99,300

as of

March 31, 2021.

Restricted Stock

. Non-vested restricted stock awards at

March 31, 2021

and changes during the

three

months ended

March 31, 2021

were as follows:

			Weighted-
			Average
	Number of		Grant-Date
	Shares		Fair Value

Non-vested at December 31, 2020	4,701,556		$	0.79
Granted	—		$	—
Vested	—		$	—
Canceled or forfeited	(120,808	)	$	0.81

Non-vested at March 31, 2021	4,580,748		$	0.79

The total fair value of restricted stock that vested during the

three

months ended

March 31, 2021

was

nil.

As of

March 31, 2021,

the total unrecognized compensation expense, net of estimated forfeitures, relating to restricted stock awards was

$1.9

million, which is expected to be recognized over the remaining weighted-average period of approximately

1.1

years.

Note 12 - Commitments and Contingencies	3 Months Ended
Note 12 - Commitments and Contingencies	Mar. 31, 2021
Notes to Financial Statements
Commitments and Contingencies Disclosure [Text Block]	12. Commitments and Contingencies Legal Matters . From time to time, the Company has been, and may again become, involved in legal proceedings arising in the ordinary course of its business. The Company is not presently a party to any litigation and is not aware of any pending or threatened litigation against the Company that it believes could have a material adverse effect on its business, operating results, financial condition or cash flows. Indemnifications . In the ordinary course of its business, the Company makes certain indemnities under which it may be required to make payments in relation to certain transactions. As of March 31, 2021, the Company did not have any liabilities associated with indemnities. In addition, the Company, as permitted under Delaware law and in accordance with its amended and restated certificate of incorporation and amended and restated bylaws, in each case, as amended to date, indemnifies its officers and directors for certain events or occurrences, subject to certain limits, while the officer or director is or was serving at the Company's request in such capacity. The duration of these indemnifications, commitments, and guarantees varies and, in certain cases, is indefinite. The maximum amount of potential future indemnification is unlimited; however, the Company has a director and officer insurance policy that may enable it to recover a portion of any future amounts paid. The Company accrues for losses for any known contingent liability, including those that may arise from indemnification provisions, when future payment is probable. No such losses have been recorded to date. Environmental Liabilities . The Company's operations are subject to environmental laws and regulations adopted by various governmental authorities in the jurisdictions in which it operates. These laws require the Company to investigate and remediate the effects of the release or disposal of materials at its locations. Accordingly, the Company has adopted policies, practices and procedures in the areas of pollution control, occupational health and the production, handling, storage and use of hazardous materials to prevent material environmental or other damage, and to limit the financial liability which could result from such events. Environmental liabilities are recorded when the Company's liability is probable, and the costs can be reasonably estimated. No environmental liabilities have been recorded as of March 31, 2021.

Note 13 - Fair Value Measurements

3 Months Ended

Mar. 31, 2021

Fair Value Disclosures [Text Block]

13.

Fair Value Measurements

Accounting standards define fair value, outline a framework for measuring fair value, and detail the required disclosures about fair value measurements. Under these standards, fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date in the principal or most advantageous market. Standards establish a hierarchy in determining the fair market value of an asset or liability. The fair value hierarchy has

three

levels of inputs, both observable and unobservable. Standards require the utilization of the highest possible level of input to determine fair value.

Level

– inputs include quoted market prices in an active market for identical assets or liabilities.

Level

– inputs are market data, other than Level

that are observable either directly or indirectly. Level

inputs include quoted market prices for similar assets or liabilities, quoted market prices in an inactive market, and other observable information that can be corroborated by market data.

Level

– inputs are unobservable and corroborated by little or

market data.

These tables present the carrying value and fair value, by fair value hierarchy, of the Company's financial instruments at

March 31, 2021

and

December 31, 2020,

respectively (in thousands). The Company believes that the fair value of its Loans Payable - Other approximated book value, which totaled

$1.2

million and

$1.3

million at

March 31, 2021

and

December 31, 2020,

respectively.

			Fair Value Measurements at March 31, 2021 (In thousands)
	Fair Value at March 31, 2021		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Recurring:
Derivative Warrant Liability	$	84	$	—	$	—	$	84

Nonrecurring
Palladium and finished goods inventory	$	880	$	264	$	616	$	—

			Fair Value Measurements at December 31, 2020 (In thousands)
	Fair Value at December 31, 2020		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Recurring:
Derivative Warrant Liability	$	31	$	—	$	—	$	31


Nonrecurring
Corn, palladium and finished goods inventory	$	866	$	235	$	631	$	—

The following table provides changes to those fair value measurements using Level

inputs for the

three

months ende

March 31

2021

(in thousands):

	Fair Value Measurements Using Significant Unobservable Inputs (Level 3)

	Derivative Warrant Liability

Balance, December 31, 2020	$	31

Total loss included in earnings		53

Balance, March 31 , 2021	$	84

There were

transfers to or from Level

in the

three

months ended

March 31

2021

Inventories.

The Company records its corn and palladium inventory at fair value only when the Company's cost of corn and palladium purchased exceeds the market value for corn. The Company determines the market value of corn and palladium based upon Level

inputs using quoted market prices. The Company records its hydrocarbon, isobutanol and ethanol inventory at market using Level

inputs.

Derivative Warrant Liability

. The Company valued the Series F Warrants and Series K Warrants using a Monte-Carlo model (Level

) and other warrants using Black-Scholes models comprised of some inputs requiring the use of Monte-Carlo models (Level

While the Company believes that its valuation methods are appropriate and consistent with other market participants, it recognizes that the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different estimate of fair value at the reporting date.

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Note 14 - Segments

3 Months Ended

Mar. 31, 2021

Segment Reporting Disclosure [Text Block]

14.

Segments

The Company's chief operating decision maker is provided with and reviews a monthly executive package which separately identifies its business segments based on the nature of the products and services offered through each of its consolidated legal entities. In

January 2021,

the Company began to separately identify the Renewal Natural Gas Segment and Net-Zero Segment in the monthly executive package. As such, the Company has determined that it has

four

operating segments: (i) Gevo segment; (ii) Agri-Energy segment; (iii) Renewable Natural Gas segment; and (iv) Net-Zero segment. Transactions between segments are eliminated in consolidation.

Gevo Segment

. The Gevo segment is responsible for all research and development activities related to the future production of isobutanol, including the development of our proprietary biocatalysts, the production and sale of bio jet fuel, the Company's retrofit process and the next generation of chemicals and biofuels that will be based on the Company's isobutanol technology. The Gevo segment also develops, maintains and protects its intellectual property portfolio, develops future markets for its isobutanol and provides corporate oversight services.

Agri-Energy Segment

. The Agri-Energy segment is currently responsible for the operation of the Company's Luverne Facility and the production of isobutanol, ethanol and related products.

Renewable Natural Gas

Segment.

The Renewable Natural Gas segment produces low-carbon methane from the manure of cows and pigs for the production of energy.

Net-Zero Segment.

The Net-Zero segment is responsible for the production of energy dense liquid hydrocarbons using renewable energy and our proprietary technology. The concept of a Net-Zero Project is to convert renewable energy (photosynthetic, wind, renewable natural gas, biogas).

The Company's chief operating decision maker is provided with and reviews the financial results of each of the Company's consolidated legal entities, Gevo, Inc. and Agri-Energy, LLC, as well as its Renewable Natural Gas and Net-Zero projects. The Company organizes its business segments based on the nature of the products and services offered through each of its consolidated legal entities. Substantially all revenue is earned and all assets are held in the U.S.

	Three Months Ended March 31,
	2021			2020
Revenues:
Gevo	$	13		$	125
Agri-Energy		80			3,700
Renewable Natural Gas		—			—
Net-Zero		—			—

Consolidated	$	93		$	3,825

Loss from operations:
Gevo	$	(5,104	)	$	(2,881	)
Agri-Energy		(2,047	)		(4,939	)
Renewable Natural Gas		(68	)		(156	)
Net-Zero		(2,659	)		—

Consolidated	$	(9,878	)	$	(7,976	)

Interest expense:
Gevo	$	—		$	543
Agri-Energy		—			2
Renewable Natural Gas		5			—
Net-Zero		—			—

Consolidated	$	5		$	545

Depreciation and amortization expense:
Gevo	$	56		$	56
Agri-Energy		1,093			1,593
Renewable Natural Gas		—			—
Net-Zero		—			—

Consolidated	$	1,149		$	1,649

Acquisitions of plant, property and equipment:
Gevo	$	253		$	10
Agri-Energy		10			791
Renewable Natural Gas		5,169			—
Net-Zero		—			—

Consolidated	$	5,432		$	801

Revenue by geographic area
United States	$	93		$	3,750
Other		—			75

Consolidated	$	93		$	3,825

	March 31,			December 31,
	2021			2020

Total assets
Gevo	$	595,834		$	152,177
Agri-Energy		129,523			131,893
Renewable Natural Gas		12,748			—
Net-Zero		110			—
Intercompany eliminations (1)		(129,487	)		(131,971	)

Consolidated (2)	$	608,728		$	152,099

	( 1 )	Includes no intercompany sales during the three months ended March 31, 2021 and $0.1 million for the year ended December 31, 2020 for hydrocarbon sales.
	( 2 )	All other significant non-cash items relate to the activities of Gevo.

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

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Note 15 - Subsequent Events	3 Months Ended
Note 15 - Subsequent Events	Mar. 31, 2021
Notes to Financial Statements
Subsequent Events [Text Block]	15. Subsequent Events Bond Issuance On April 15, 2021, the Iowa Finance Authority (the “Authority”) issued an aggregate principal amount of $68,155,000 of its Solid Waste Facility Revenue Bonds (Gevo NW Iowa RNG, LLC Renewable Natural Gas Project), Series 2021 (Green Bonds) (the “2021 Bonds”) in a public offering for the benefit of Gevo RNG, a subsidiary of Gevo. The Bonds initially bear interest at the rate of 1.50% per annum during the Initial Term Rate Period (as defined in the hereinafter defined Indenture), payable semi-annually on January 1 and July 1 of each year, commencing on July 1, 2021, mature on January 1, 2042, and are subject to mandatory tender for purchase and optional redemption pursuant to the terms of the Indenture (as defined below). The 2021 Bonds were issued under a Trust Indenture, dated as of April 1, 2021 ( the “Indenture”), between the Authority and Citibank, N.A., as trustee (the “Trustee”). The principal of and the interest on the 2021 Bonds is payable solely from (i) payments to be made by Gevo RNG to the Trustee pursuant to a separate financing agreement, dated as of April 1, 2021 ( the “Bond Financing Agreement”), between Gevo RNG and the Authority, (ii) all moneys received by the Authority or the Trustee in respect of payment of the loan of the proceeds of the 2021 Bonds from the Authority to Gevo RNG pursuant to the Bond Financing Agreement, (iii) all moneys and investments in the “Bond Fund” established and maintained by the Trustee pursuant to the Indenture, including without limitation moneys received by the Trustee pursuant to the Letter of Credit (as defined below), (iv) all moneys and investments in the “Project Fund” established and maintained by the Trustee pursuant to the Indenture from proceeds of the sale of the 2021 Bonds, and (v) all income and profit from the investment of the foregoing moneys, excluding any payments received by the Authority pursuant to rights of the Authority to receive certain additional payments and reimbursements of expenses as set forth in the Bond Financing Agreement. Pursuant to the Bond Financing Agreement, the proceeds of the 2021 Bonds will be loaned to Gevo RNG ( 1 ) to finance in part the construction of the biogas facility to be developed, designed, constructed, owned and operated by or on behalf of Gevo RNG, which is comprised of (A) three anaerobic digesters and related equipment situated on dairy farms located in Northwest Iowa that will produce partially conditioned raw biogas from cow manure, (B) gathering pipelines to transport biogas to a centrally located gas upgrade system, (C) a centrally located gas upgrade system located in Doon, Iowa that will upgrade biogas to pipeline quality natural gas and interconnect to Northern Natural Gas' interstate pipeline and (D) other related improvements, ( 2 ) to capitalize a portion of the interest due on the 2021 Bonds during the Initial Term Rate Period to be used to reimburse the Credit Facility Provider (as defined below) for interest draws on the Letter of Credit during such period, and ( 3 ) to pay a portion of the costs of issuing the 2021 Bonds. On April 15, 2021, Gevo obtained a letter of credit for $71.2 million (the “Letter of Credit”) from Citibank, N.A., in its capacity as credit facility provider (the “Credit Facility Provider”), pursuant to the terms of a letter of credit reimbursement agreement dated as of April 1, 2021 ( the “Reimbursement Agreement”), between Gevo and the Credit Facility Provider. The Letter of Credit will permit the Trustee to draw thereon in accordance with its terms in amounts sufficient to pay the principal and purchase price of the 2021 Bonds and up to 203 days' interest on the 2021 Bonds. Pursuant to the terms of the Reimbursement Agreement, Gevo is obligated to reimburse the Credit Facility Provider for amounts drawn under the Letter of Credit. It is expected that payments of the principal of and interest on the 2021 Bonds, and the purchase price of 2021 Bonds that are tendered for mandatory purchase and not remarketed, will be made by draws on the Letter of Credit. Gevo has pledged and assigned cash to the Credit Facility Provider as security for the reimbursement obligations of Gevo pursuant to the Reimbursement Agreement in an amount equal to the principal amount of the 2021 Bonds plus three years of interest payments on the 2021 Bonds.

Significant Accounting Policies (Policies)	3 Months Ended
Significant Accounting Policies (Policies)	Mar. 31, 2021
Accounting Policies [Abstract]
Nature of Business [Policy Text Block]	Nature of Business . Gevo, Inc. (“Gevo” or the “Company,” which, unless otherwise indicated, refers to Gevo, Inc. and its subsidiaries) is a growth-oriented renewable fuels technology and development company that is commercializing the next generation of renewable low-carbon liquid transportation fuels, such as sustainable aviation fuel (“SAF”) and renewable isooctane (which we refer to as “renewable premium gasoline”), with the potential to achieve a “net zero” greenhouse gas (“GHG”) footprint and address global needs of reducing GHG emissions with sustainable alternatives to petroleum fuels. Its technology transforms carbon from the atmosphere using photosynthetic energy, wind energy and biogas energy into liquid hydrocarbons with a low or potentially “net-zero” GHG footprint. As next generation renewable fuels, Gevo's hydrocarbon transportation fuels have the advantage of being “drop-in” substitutes for conventional fuels that are derived from crude oil, working seamlessly and without modification in existing fossil-fuel based engines, supply chains and storage infrastructure. In addition, with SAF, the carbon footprint of air travel can be reduced, or in the long run, eliminated on a net carbon basis, without change to planes or fuel systems. In addition to the potential of net- zero carbon emissions across the whole fuel life-cycle, its renewable fuels eliminate other pollutants associated with the burning of traditional fossil fuels such as particulates and sulfur, while delivering superior performance. Gevo uses low-carbon, renewable resource-based raw materials as feedstocks. In the near-term, its feedstocks will primarily consist of non-food corn. As the Company's technology is applied globally, feedstocks can consist of sugar cane, molasses or other cellulosic sugars derived from wood, agricultural residues and waste. Gevo's patented fermentation yeast biocatalyst produces isobutanol, a four -carbon alcohol, via the fermentation of renewable plant biomass carbohydrates. The resulting renewable isobutanol has a variety of direct applications but, more importantly to our fundamental strategy, serves as a building block to make renewable isooctane (which we refer to as renewable premium gasoline) and SAF using simple and common chemical conversion processes. The Company also plans to reduce or eliminate fossil-based process energy inputs by replacing them with renewable energy such as wind-powered electricity and renewable natural gas (“RNG”). Gevo's technology represents a new generation of renewable fuel technology that overcomes the limitations of first -generation renewable fuels. Ultimately, the Company believes that the attainment of profitable operations is dependent upon future events, including, but not limited to (i) the successful development of the Net-Zero 1 Project, for the production of energy dense liquid hydrocarbons using renewable energy and our proprietary technology; and (ii) the achievement of a level of revenues adequate to support its cost structure. COVID- 19. The novel coronavirus ("COVID- 19" ) pandemic has had an adverse impact on global commercial activity, including the global transportation industry and its supply chain, and has contributed to significant volatility in financial markets. It has also resulted in increased travel restrictions and extended shutdowns of businesses in various industries including, among others, the airline industry, and significantly reduced overall economic output. It is possible that that the impact of the COVID- 19 pandemic on general economic activity could continue to negatively impact the Company's revenue and operating results for 2021 and beyond. In light of the current and potential future disruption to its business operations and those of its customers, suppliers and other third parties with whom the Company does business, management considered the impact of the COVID- 19 pandemic on its business. The impact of the COVID- 19 pandemic on the global transportation industry could continue to result in less demand for the Company's transportation fuel products, which could have a material adverse effect on the Company's business, financial condition and prospects for the foreseeable future. During the first quarter of 2020, we suspended our ethanol production at our production facility in Luverne, Minnesota (the "Luverne Facility") due to COVID- 19 and an unfavorable commodity environment, largely the result of greater corn costs as compared to national markets than the region has historically produced. The suspension of ethanol production and reduction in the Company's workforce that occurred during the first quarter of 2020 due to the impact of COVID- 19 had an adverse impact on Gevo's financial results for the three months ended March 31, 2021 reducing revenue by 98% compared to the three months ended March 31, 2020. There is also a risk that COVID- 19 could have a material adverse impact on the development of the Company's Net-Zero 1 Project, customer demand and cash flow, depending on the extent of our future production activities. The Company has considered multiple scenarios, with both positive and negative inputs, as part of the significant estimates and assumptions that are inherent in its financial statements and are based on trends in customer behavior and the economic environment throughout the three months ended March 31, 2021 and beyond as the COVID- 19 pandemic has impacted the industries in which the Company operates. These estimates and assumptions include the collectability of billed receivables and the estimation of revenue and tangible assets. With regard to collectability, the Company believes it may face atypical delays in client payments going forward but the Company has not experienced significant delays in collection as of March 31, 2021. In addition, management believes that the demand for certain discretionary lines of business may decrease, and that such decrease will impact its financial results in succeeding periods. Non-discretionary lines of business may also be adversely affected, for example because reduced economic activity or disruption in hydrocarbon markets reduces demand for or the extent of SAF, isooctane and isooctene.
Financial Condition [Policy Text Block]	Financial Condition . The Company has incurred consolidated net losses since inception and had a significant accumulated deficit as of March 31, 2021. The Company's cash and cash equivalents as of March 31, 2021 totaled $525.3 million. Gevo expects to use its cash and cash equivalents for the following purposes: (i) development of the Luverne Facility expansion plan; (ii) identification of new production facilities and to plan for expanded production to fulfill existing off-take agreements; (iii) operating activities at the Company's corporate headquarters in Colorado, including research and development work; (iv) development projects associated with the Company's RNG projects; (v) exploration of strategic alternatives and additional financings, including project financing; and (vi) future debt service obligations. The Company expects to incur future net losses as it continues to fund the development and commercialization of its product candidates. To date, the Company has financed its operations primarily with proceeds from issuance of equity and debt securities, borrowings under debt facilities and product sales. The Company's transition to profitability is dependent upon, among other things, the successful development and commercialization of its product candidates and the achievement of a level of revenues adequate to support the Company's cost structure. The Company may never achieve profitability or positive cash flows, and unless and until it does, the Company will continue to need to raise additional capital. Management intends to fund future operations through additional private and/or public offerings of debt or equity securities. In addition, the Company may seek additional capital through arrangements with strategic partners or from other sources, and it will continue to address its cost structure. Notwithstanding, there can be no assurance that the Company will be able to raise additional funds or achieve or sustain profitability or positive cash flows from operations. Management believes it has adequate cash to fund operations for at least one year from the date the financial statements are issued.
Stockholders' Equity, Policy [Policy Text Block]	January 2021 Offering. On January 19, 2021, the Company completed a registered direct offering pursuant to a securities purchase agreement with certain institutional and accredited investors providing for the issuance and sale by the Company of an aggregate of 43,750,000 shares of the Company's common stock (the “2021 Shares”) at a price of $8.00 per share (the “January 2021 Offering”). The net proceeds to the Company from the January 2021 Offering were approximately $321.9 million, after deducting placement agent fees and other estimated offering expenses payable by the Company. At-the-Market Offering Program. In February 2018, the Company commenced an at-the-market offering program, which allows it to sell and issue shares of its common stock from time-to-time. In December 2020, the at-the-market offering program was amended to provide available capacity of $150.0 million. During the three months ended March 31, 2021, the Company issued 24,420,579 shares of common stock under the at-the-market offering program for total proceeds of $135.8 million, net of commissions and other offering related expenses. As of March 31, 2021, the Company has remaining capacity to issue up to approximately $10.6 million of common stock under the at-the-market offering program.
Basis of Accounting, Policy [Policy Text Block]	Basis of Presentation. The unaudited consolidated financial statements of the Company (which include the accounts of its wholly-owned subsidiaries Gevo Asset, LLC (“Gevo Asset”), Gevo RNG Holdco, LLC ("Gevo RNG Holdco"), Gevo NW Iowa RNG, LLC ("Gevo RNG") and Agri-Energy, LLC (“Agri-Energy”)) have been prepared, without audit, pursuant to the rules and regulations of the U.S. Securities and Exchange Commission (the “SEC”). Accordingly, they do not include all information and footnotes required by accounting principles generally accepted in the United States (“GAAP”) for complete financial statements. These statements reflect all normal and recurring adjustments which, in the opinion of management, are necessary to present fairly the financial position, results of operations and cash flows of the Compan y at March 31, 2021 and are not necessarily indicative of the results to be expected for the full year. These statements should be read in conjunction with the Company's audited consolidated financial statements and notes thereto included under the heading “Financial Statements and Supplementary Data” in Part II, Item 8 of the Company's Annual Report on Form 10 -K for the year ended December 31, 2020.
Preliminary Stage Project Costs [Policy Text Block]	Preliminary Stage Project Costs. Preliminary stage project costs consist of research and development expense in addition to selling, general and administrative expenses related to our RNG and Net-Zero projects.
Reclassification, Comparability Adjustment [Policy Text Block]	Reclassifications. The Company reclassified certain prior period amounts to conform to the current period presentation, including the categorization of preliminary stage project costs on the Consolidated Statements of Operations. These reclassifications had no impact on total revenues, total cost of goods sold, total operating expenses, net loss or stockholders' equity for any period.
Income Tax, Policy [Policy Text Block]	Income Taxes. There is no provision for income taxes because the Company has incurred operating losses since inception.
Concentration Risk, Credit Risk, Policy [Policy Text Block]	Concentration of Business Risk. As of March 31, 2021, four companies, Total Petrochemicals & Refining USA, Inc. ("Total"), Juhl Clean Energy Assets, Inc. ("Juhl"), AvFuel Corporation ("AvFuel") and Wisconsin Bioproducts ("Wisconsin"), comprised approximately 41%, 27%, 16% and 14%, or approximately 98% in total, of the Company's outstanding trade accounts receivable, respectively. As of December 31, 2020, one customer, HCS Group GmbH ("HCS") comprised approximately 79% of the Company's outstanding trade accounts receivable, respectively. For the three months ended March 31, 2021, New Vision, LLC ("New Vision") and Av Fuel accounted for approximately 79% and 15%, or approximately 94% in total, of the Company's consolidated revenue, respectively. For the three months ended March 31, 2020, Eco-Energy, LLC ("Eco-Energy") and Purina Animal Nutrition, LLC ("Purina") represented approximately 73% and 22%, or approximately 95% in total, of the Company's consolidated revenue, respectively. Total, AvFuel, Wisconsin and HCS are customers of the Company's Gevo segment. New Vision, Eco-Energy and Purina are customers of the Company's Agri-Energy segment (see Note 14 ).

Disclosure of accounting policy for income taxes, which may include its accounting policies for recognizing and measuring deferred tax assets and liabilities and related valuation allowances, recognizing investment tax credits, operating loss carryforwards, tax credit carryforwards, and other carryforwards, methodologies for determining its effective income tax rate and the characterization of interest and penalties in the financial statements.

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-Section 50
-Paragraph 17
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32809-109319

Note 2 - Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2021

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]

	Three Months Ended March 31,
	2021		2020

Warrants to purchase common stock - liability classified		56,735		54,669
Warrant to purchase common stock - equity classified		94,108		—
Conversion of 2020/21 Notes		—		6,713,817
Outstanding options to purchase common stock		1,517		1,561
Stock appreciation rights		67,739		67,739

Total		220,099		6,837,786

Note 3 - Revenues From Contracts With Customers and Other Revenues (Tables)

3 Months Ended

Mar. 31, 2021

Disaggregation of Revenue [Table Text Block]

	Three Months Ended March 31, 2021
Major Goods/Service Line	Revenues from Contracts with Customers		Other Revenues		Total

Hydrocarbon revenue	$	13	$	—	$	13
Other revenue		—		80		80

	$	13	$	80	$	93
Timing of Revenue Recognition
Goods transferred at a point in time	$	13	$	—	$	13
Services transferred over time		—		80		80

	$	13	$	80	$	93

	Three Months Ended March 31, 2020
Major Goods/Service Line	Revenues from Contracts with Customers		Other Revenues		Total

Ethanol sales and related products, net	$	3,700	$	—	$	3,700
Hydrocarbon revenue		125		—		125

	$	3,825	$	—	$	3,825
Timing of Revenue Recognition
Goods transferred at a point in time	$	3,825	$	—	$	3,825
Services transferred over time		—		—		—

	$	3,825	$	—	$	3,825

Note 4 - Leases, Right-to-use Assets and Related Liabilities (Tables)

3 Months Ended

Mar. 31, 2021

Lease, Cost [Table Text Block]

	Three Months Ended March 31,
	2021			2020
Lease Cost
Financing lease cost	$	11		$	1
Operating lease cost		61			471
Short-Term lease cost		132			80
Variable lease cost (1)		39			32

Total lease cost	$	243		$	584

(1) Represents amounts incurred in excess of minimum payments for common area maintenance and present value discounts

	Three Months Ended March 31,
	2021			2020
Other Information
Cash paid for the measurement of lease liabilities:
Operating cash flows from finance lease	$	6		$	1
Operating cash flows from operating leases		61			471
Finance cash flows from finance lease		7			—
Right-to-use asset obtained in exchange for new financing lease liability		—			13
Right-to-use asset obtained in exchange for new operating lease liability		1,562
Weighted-average remaining lease term, financing lease (months)		221			59
Weighted-average remaining lease term, operating leases (months)		94			18
Weighted-average discount rate - financing lease (2)		13	%		21	%
Weighted-average discount rate - operating leases (3)		5	%		12	%

(2) The discount rate used for the finance lease was based on the rate implicit in the lease.
(3) The discount rate used for operating leases is based on our implicit borrowing rate at the date the Company entered into the lease.

Lessee, Operating Lease, Liability, Maturity [Table Text Block]

Year Ending December 31,	Operating Leases			Financing Leases

2021 (remaining)	$	103		$	25
2022		24			26
2023		297			26
2024		305			26
2025		1,042			22
2026 and thereafter		1,030			301
Total		2,801			426
Less: Amounts representing present value discounts		(1,138	)	(263		)

Total lease liabilities	$	1,663		$	163

Note 5 - Inventories (Tables)

3 Months Ended

Mar. 31, 2021

Schedule of Inventory, Current [Table Text Block]

	March 31,		December 31,
	2021		2020
Raw materials
Enzymes and other inputs	$	121	$	133
Nutrients		1		1
Finished goods
SAF, Isooctane and Isooctene		725		756
Work in process
Gevo		5		5
Palladium		235		235
Spare parts		1,365		1,361

Total inventories	$	2,452	$	2,491

Note 6 - Property, Plant and Equipment (Tables)

3 Months Ended

Mar. 31, 2021

Property, Plant and Equipment [Table Text Block]

	Useful Life		March 31,			December 31,
	(in years)		2021			2020

Luverne retrofit asset		20	$	70,820		$	70,820
Plant machinery and equipment		10		17,374			17,374
Site improvements		10		7,157			7,157
Lab equipment, furniture and fixtures and vehicles		5		6,396			6,396
Demonstration plant		2		3,597			3,597
Buildings		10		2,543			2,543
Leasehold improvements, pilot plant, land and support equipment		2 to 5		2,523			2,523
Computer, office equipment and software		3 to 6		2,021			1,983
Construction in progress		—		18,525			13,132

Total property, plant and equipment				130,956			125,525
Less accumulated depreciation and amortization				(60,260	)		(59,117	)

Property, plant and equipment, net			$	70,696		$	66,408

Schedule of Depreciation and Amortization Expense [Table Text Block]

	Three Months Ended March 31 ,
	2021		2020

Cost of goods sold	$	1,088	$	1,587
Operating expenses		56		56

Total depreciation and amortization	$	1,144	$	1,643

Note 7 - Embedded Derivatives Liabilities (Tables)

3 Months Ended

Mar. 31, 2021

Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]

	Issuance Date	Expiration Date	Exercise Price as of March 31, 2021		Shares Underlying Warrants on Issuance Date	Shares Issued upon Warrant Exercises as of March 31, 2021	Shares Underlying Warrants Outstanding as of March 31, 2021

Series F Warrants	04/01/2016	04/01/2021	$	40.00	25,733	11,692	14,041
Series I Warrants	09/13/2016	09/13/2021	$	220.00	35,368	—	35,368
Series K Warrants	02/17/2017	2/17/2022	$	2.00	315,986	308,660	7,326
Series 2020-A Warrants (1)	7/6/2020	7/6/2025	$	0.60	30,000,000	29,905,892	94,108

					30,377,087	30,226,244	150,843

Exercise of Warrants [Table Text Block]

	Common Stock Issued		Proceeds

Series 2020-A Warrants		1,863,058	$	1,117

Note 8 - Accounts Payable and Accrued Liabilities (Tables)

3 Months Ended

Mar. 31, 2021

Schedule of Accounts Payable and Accrued Liabilities [Table Text Block]

	March 31,		December 31,
	2021		2020

Accrued employee compensation	$	1,677	$	1,960
Accounts payable - trade		3,841		897
Accrued utilities and supplies		58		5
Other accrued liabilities		4,134		1,263

Total accounts payable and accrued liabilities	$	9,710	$	4,125

Note 9 - Debt (Tables)

3 Months Ended

Mar. 31, 2021

Schedule of Long-term Debt Instruments [Table Text Block]

	Interest Rate	Maturity Date	March 31 , 2021			December 31, 2020

SBA Loans	1%	April 2025	$	1,006		$	1,006
Equipment	4% - 5%	October 2021 - December 2024		222			248

Total notes payable - other				1,228			1,254
Less current portion				(1,016	)		(807	)

Long-term portion			$	212		$	447

Schedule of Maturities of Long-term Debt [Table Text Block]

Year ending December 31,

2021 (remaining)	$	778
2022		356
2023		62
2024		32

	$	1,228

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Note 11 - Stock-based Compensation (Tables)

3 Months Ended

Mar. 31, 2021

Share-based Payment Arrangement, Cost by Plan [Table Text Block]

	Three Months Ended March 31,
	2021		2020
Restricted stock
Research and development	$	125	$	76
Selling, general and administrative		437		260

Stock appreciation rights
Research and development		348		(79	)
Selling, general and administrative		15		(85	)

Total stock-based compensation	$	925	$	172

Share-based Payment Arrangement, Option, Activity [Table Text Block]

					Weighted-
					Average
			Weighted-		Remaining
			Average		Contractual	Aggregate
	Number of		Exercise		Term	Intrinsic
	Options		Price (1)		(years)	Value

Options outstanding at December 31, 2020	1,552		$	556.13	5.58	$	—
Granted	—		$	—
Canceled or forfeited	(35	)	$	876.00
Exercised	—		$	—

Options outstanding at March 31, 2021	1,517		$	548.75	5.36	$	—

Options exercisable at March 31, 2021	1,517		$	548.75	5.36	$	—

Options vested and expected to vest at March 31, 2021	1,517		$	548.75	5.36	$	—

Schedule of Nonvested Share Activity [Table Text Block]

			Weighted-
			Average
	Number of		Grant-Date
	Shares		Fair Value

Non-vested at December 31, 2020	4,701,556		$	0.79
Granted	—		$	—
Vested	—		$	—
Canceled or forfeited	(120,808	)	$	0.81

Non-vested at March 31, 2021	4,580,748		$	0.79

Note 13 - Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2021

Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]

			Fair Value Measurements at March 31, 2021 (In thousands)
	Fair Value at March 31, 2021		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Recurring:
Derivative Warrant Liability	$	84	$	—	$	—	$	84

Nonrecurring
Palladium and finished goods inventory	$	880	$	264	$	616	$	—

			Fair Value Measurements at December 31, 2020 (In thousands)
	Fair Value at December 31, 2020		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Recurring:
Derivative Warrant Liability	$	31	$	—	$	—	$	31


Nonrecurring
Corn, palladium and finished goods inventory	$	866	$	235	$	631	$	—

Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]

	Fair Value Measurements Using Significant Unobservable Inputs (Level 3)

	Derivative Warrant Liability

Balance, December 31, 2020	$	31

Total loss included in earnings		53

Balance, March 31 , 2021	$	84

Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances.

+ References + Details

Note 14 - Segments (Tables)

3 Months Ended

Mar. 31, 2021

Schedule of Segment Reporting Information, by Segment [Table Text Block]

	Three Months Ended March 31,
	2021			2020
Revenues:
Gevo	$	13		$	125
Agri-Energy		80			3,700
Renewable Natural Gas		—			—
Net-Zero		—			—

Consolidated	$	93		$	3,825

Loss from operations:
Gevo	$	(5,104	)	$	(2,881	)
Agri-Energy		(2,047	)		(4,939	)
Renewable Natural Gas		(68	)		(156	)
Net-Zero		(2,659	)		—

Consolidated	$	(9,878	)	$	(7,976	)

Interest expense:
Gevo	$	—		$	543
Agri-Energy		—			2
Renewable Natural Gas		5			—
Net-Zero		—			—

Consolidated	$	5		$	545

Depreciation and amortization expense:
Gevo	$	56		$	56
Agri-Energy		1,093			1,593
Renewable Natural Gas		—			—
Net-Zero		—			—

Consolidated	$	1,149		$	1,649

Acquisitions of plant, property and equipment:
Gevo	$	253		$	10
Agri-Energy		10			791
Renewable Natural Gas		5,169			—
Net-Zero		—			—

Consolidated	$	5,432		$	801

Revenue by geographic area
United States	$	93		$	3,750
Other		—			75

Consolidated	$	93		$	3,825

	March 31,			December 31,
	2021			2020

Total assets
Gevo	$	595,834		$	152,177
Agri-Energy		129,523			131,893
Renewable Natural Gas		12,748			—
Net-Zero		110			—
Intercompany eliminations (1)		(129,487	)		(131,971	)

Consolidated (2)	$	608,728		$	152,099

Note 1 - Nature of Business, Financial Condition and Basis of Presentation (Details Textual) $ / shares in Units, $ in Thousands		1 Months Ended	3 Months Ended		12 Months Ended
	Jan. 19, 2021 USD ($) $ / shares shares	Dec. 31, 2020 USD ($)	Mar. 31, 2021 USD ($) shares	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)
Cash and Cash Equivalents, at Carrying Value, Ending Balance		$ 78,338	$ 525,323		$ 78,338
Proceeds from Issuance or Sale of Equity, Total	$ 321,900
Proceeds from Issuance of Common Stock			489,373	$ 958
Income Tax Expense (Benefit), Total			$ 0
Customer Concentration Risk [Member] \| Accounts Receivable [Member]
Number of Customers			4		1
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Total Petrochemicals & Refining USA, Inc. [Member]
Concentration Risk, Percentage			41.00%
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Juhl Clean Energy [Member]
Concentration Risk, Percentage			27.00%
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| AvFuel Corporation [Member]
Concentration Risk, Percentage			16.00%
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Wisconsin Bioproducts [Member]
Concentration Risk, Percentage			14.00%
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Total Petrochemicals, Juhl Clean Energy, AvFuel Corporation, and Wisconsin Bioproducts [Member]
Concentration Risk, Percentage			98.00%
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| HCS Group GmbH [Member]
Concentration Risk, Percentage					79.00%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| AvFuel Corporation [Member]
Concentration Risk, Percentage			15.00%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| New Vision, LLC [Member]
Concentration Risk, Percentage			79.00%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| New Vision, LLC and AvFuel Corporation [Member]
Concentration Risk, Percentage			94.00%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Eco-Energy, LLC [Member]
Concentration Risk, Percentage				73.00%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Purina Animal Nutrition, LLC [Member]
Concentration Risk, Percentage				22.00%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Eco-Energy, LLC and Purina Animal Nutrition, LLC [Member]
Concentration Risk, Percentage				95.00%
January 2021 Offering [Member]
Stock Issued During Period, Shares, New Issues (in shares) \| shares	43,750,000
Shares Issued, Price Per Share (in dollars per share) \| $ / shares	$ 8
At-the-market Offering [Member]
Stock Issued During Period, Shares, New Issues (in shares) \| shares			24,420,579
Increase (Decrease) in At-the-Market Offering of Stock		$ 150,000
Proceeds from Issuance of Common Stock			$ 135,800
Offering of Stock, Remaining Capacity, Value			$ 10,600
COVID-19 [Member]
Percentage of Revenue Reduction			98.00%

Note 2 - Earnings Per Share - Securities Potentially Dilute Calculation of Diluted Earnings Per Share (Details) - shares	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Antidilutive securities (in shares)	220,099	6,837,786
Warrants to Purchase Common Stock - Liability Classified [Member]
Antidilutive securities (in shares)	56,735	54,669
Warrants to Purchase Common Stock - Equity Classified [Member]
Antidilutive securities (in shares)	94,108
Convertible 2020/21 Notes [Member]
Antidilutive securities (in shares)		6,713,817
Share-based Payment Arrangement, Option [Member]
Antidilutive securities (in shares)	1,517	1,561
Stock Appreciation Rights (SARs) [Member]
Antidilutive securities (in shares)	67,739	67,739

Note 3 - Revenues From Contracts With Customers and Other Revenues (Details Textual) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Revenue from Contract with Customer, Including Assessed Tax	$ 13	$ 3,825
Contract with Customer, Asset, after Allowance for Credit Loss, Total	0		$ 0
Contract with Customer, Asset, Credit Loss Expense (Reversal)	0		0
Transferred at Point in Time [Member]
Revenue from Contract with Customer, Including Assessed Tax	13	3,825
Transferred at Point in Time [Member] \| Variable Consideration or Multiple Performance Obligations [Member]
Revenue from Contract with Customer, Including Assessed Tax	0	0
Revenue, Remaining Performance Obligation, Amount	0		0
Transferred over Time [Member]
Revenue from Contract with Customer, Including Assessed Tax
Transferred over Time [Member] \| Variable Consideration or Multiple Performance Obligations [Member]
Revenue from Contract with Customer, Including Assessed Tax	0	$ 0
Revenue, Remaining Performance Obligation, Amount	$ 0		$ 0

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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Note 3 - Revenues From Contracts With Customers and Other Revenues - Disaggregated Revenues (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenue from Contract with Customer, Including Assessed Tax	$ 13	$ 3,825
Other revenues	80
Total revenues	93	3,825
Transferred at Point in Time [Member]
Revenue from Contract with Customer, Including Assessed Tax	13	3,825
Other revenues
Total revenues	13	3,825
Transferred over Time [Member]
Revenue from Contract with Customer, Including Assessed Tax
Other revenues	80
Total revenues	80
Hydrocarbon [Member]
Revenue from Contract with Customer, Including Assessed Tax	13	125
Other revenues
Total revenues	13	125
Ethanol Sales and Related Products [Member]
Revenue from Contract with Customer, Including Assessed Tax		3,700
Other revenues
Total revenues		$ 3,700
Grant and Other [Member]
Revenue from Contract with Customer, Including Assessed Tax
Other revenues	80
Total revenues	$ 80

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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-Section 50
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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-Paragraph 3
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
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Reference 10: http://www.xbrl.org/2003/role/disclosureRef
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Reference 11: http://www.xbrl.org/2003/role/disclosureRef
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Reference 12: http://www.xbrl.org/2003/role/disclosureRef
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Reference 13: http://www.xbrl.org/2003/role/disclosureRef
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Operating cash flows from finance lease

Note 4 - Leases, Right-to-use Assets and Related Liabilities (Details Textual) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($)	Dec. 31, 2021
Operating Lease, Liability, Total	$ 1,663
Lessee, Operating Lease, Lease Not yet Commenced, Amount	2
Operating Lease, Lease Income, Total	$ 100
Northwest Iowa, Land Lease Agreement [Member] \| Forecast [Member]
Lessee, Operating Lease, Term of Contract (Year)		10 years
Deposits and Other Assets [Member]
Operating Lease, Right-of-Use Asset	1,700
Other Noncurrent Liabilities [Member]
Operating Lease, Liability, Total	$ 1,900

Note 4 - Leases, Right-to-use Assets and Related Liabilities - Lease Costs (Details) - USD ($)
$ in Thousands

3 Months Ended

Mar. 31, 2021

Mar. 31, 2020

Financing lease cost

$ 11

$ 1

Operating lease cost

471

Short-Term lease cost

132

Variable lease cost (1)

^[1]

Total lease cost

243

584

Operating cash flows from operating leases

471

Finance cash flows from finance lease

Right-of-use asset purchased with operating lease

$ 1,562

Weighted-average remaining lease term, financing lease (months) (Month)

18 years 150 days

4 years 330 days

Weighted-average remaining lease term, operating leases (months) (Month)

7 years 300 days

1 year 180 days

Weighted-average discount rate - financing lease (2)

^[2]

13.00%

21.00%

Weighted-average discount rate - operating leases (3)

^[3]

5.00%

12.00%

[1]	Represents amounts incurred in excess of minimum payments for common area maintenance and present value discounts.
[2]	The discount rate used for the finance lease was based on the rate implicit in the lease.
[3]	The discount rate used for operating leases is based on our implicit borrowing rate at the date the Company entered into the lease.

Note 4 - Leases, Right-to-use Assets and Related Liabilities - Future Minimum Payments Under Non-cancelable Operating Leases (Details) $ in Thousands	Mar. 31, 2021 USD ($)
2021 (remaining), operating lease	$ 103
2021 (remaining), financing leases	25
2022, operating lease	24
2022, financing leases	26
2023, operating lease	297
2023, financing leases	26
2024, operating lease	305
2024, financing leases	26
2025, operating lease	1,042
2025, financing leases	22
2026 and thereafter, operating lease	1,030
2026 and thereafter, financing leases	301
Total, operating lease	2,801
Total, financing leases	426
Less: Amounts representing present value discounts, operating lease	(1,138)
Less: Amounts representing present value discounts, financing leases	(263)
Total lease liabilities, operating lease	1,663
Total lease liabilities, financing leases	$ 163

Note 5 - Inventories - Components of Inventory Balances (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Spare parts	$ 1,365	$ 1,361
Total inventories	2,452	2,491
Enzymes and Other Inputs [Member]
Raw materials	121	133
Nutrients [Member]
Raw materials	1	1
Jet Fuels, Isooctane and Isooctene [Member]
Finished goods	725	756
Gevo [Member]
Work in process	5	5
Palladium [Member]
Other Inventory	$ 235	$ 235

Note 6 - Property, Plant and Equipment - Property, Plant and Equipment by Classification (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Property, plant, and equipment, gross	$ 130,956	$ 125,525
Less accumulated depreciation and amortization	(60,260)	(59,117)
Property, plant and equipment, net	$ 70,696	66,408
Retrofit Assets [Member]
Property, plant and equipment, useful life (Year)	20 years
Property, plant, and equipment, gross	$ 70,820	70,820
Machinery and Equipment [Member]
Property, plant and equipment, useful life (Year)	10 years
Property, plant, and equipment, gross	$ 17,374	17,374
Site Improvement [Member]
Property, plant and equipment, useful life (Year)	10 years
Property, plant, and equipment, gross	$ 7,157	7,157
Lab Equipment, Furniture and Fixtures, and Vehicles [Member]
Property, plant and equipment, useful life (Year)	5 years
Property, plant, and equipment, gross	$ 6,396	6,396
Demonstration Plant [Member]
Property, plant and equipment, useful life (Year)	2 years
Property, plant, and equipment, gross	$ 3,597	3,597
Building [Member]
Property, plant and equipment, useful life (Year)	10 years
Property, plant, and equipment, gross	$ 2,543	2,543
Leasehold Improvements [Member]
Property, plant, and equipment, gross	$ 2,523	2,523
Leasehold Improvements [Member] \| Minimum [Member]
Property, plant and equipment, useful life (Year)	2 years
Leasehold Improvements [Member] \| Maximum [Member]
Property, plant and equipment, useful life (Year)	5 years
Computer, Office Equipment, and Software [Member]
Property, plant, and equipment, gross	$ 2,021	1,983
Computer, Office Equipment, and Software [Member] \| Minimum [Member]
Property, plant and equipment, useful life (Year)	3 years
Computer, Office Equipment, and Software [Member] \| Maximum [Member]
Property, plant and equipment, useful life (Year)	6 years
Construction in Progress [Member]
Property, plant, and equipment, gross	$ 18,525	$ 13,132

Note 6 - Property, Plant and Equipment - Depreciation and Amortization Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Depreciation and amortization	$ 1,144	$ 1,643
Cost of Sales [Member]
Depreciation and amortization	1,088	1,587
Operating Expense [Member]
Depreciation and amortization	$ 56	$ 56

Note 7 - Embedded Derivatives Liabilities (Details Textual) shares in Thousands	3 Months Ended
	Mar. 31, 2021 shares
Class of Warrant or Right, Issued During Period (in shares)	0

Note 7 - Embedded Derivatives Liabilities - Schedule of Shares Issued Upon Exercise of Warrants (Details) - $ / shares

3 Months Ended

Mar. 31, 2021

Dec. 31, 2019

150,843

30,377,087

Series F Warrants [Member]

30,226,244

Apr. 01, 2016

Apr. 01, 2021

$ 40

14,041

25,733

Series I Warrants [Member]

11,692

Sep. 13, 2016

Sep. 13, 2021

$ 220

35,368

Series K Warrants [Member]

Feb. 17, 2017

Feb. 17, 2022

$ 2

7,326

315,986

The Series 2020 A Warrants [Member]

308,660

^[1]

Jul. 06, 2020

^[1]

Jul. 06, 2025

^[1]

$ 0.60

^[1]

94,108

30,000,000

Options outstanding (in shares)

^[1]

29,905,892

[1]	The Series 2020-A Warrants are equity-classified warrants.

Note 7 - Embedded Derivatives Liabilities - Exercise of Warrants (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Proceeds	$ 1,117
The Series 2020 A Warrants [Member]
Common Stock Issued (in shares)	1,863,058
Proceeds	$ 1,117

Note 8 - Accounts Payable and Accrued Liabilities - Components Accounts Payable and Accrued Liabilities in Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Accrued employee compensation	$ 1,677	$ 1,960
Accounts payable - trade	3,841	897
Accrued utilities and supplies	58	5
Other accrued liabilities	4,134	1,263
Total accounts payable and accrued liabilities	$ 9,710	$ 4,125

Note 9 - Debt (Details Textual) - USD ($) $ in Thousands		1 Months Ended
Note 9 - Debt (Details Textual) - USD ($) $ in Thousands	Apr. 15, 2021	Apr. 30, 2020	Mar. 31, 2021	Dec. 31, 2020
Long-term Debt, Current Maturities, Total			$ 1,016	$ 807
SBA Loans [Member]
Proceeds from Issuance of Long-term Debt, Total		$ 1,000
Debt Instrument, Periodic Payment, Total		$ 60
SBA Loans [Member] \| Subsequent Event [Member]
Debt Instrument, Periodic Payment, Total	$ 8
Debt Instrument, Decrease, Forgiveness	500
Long-term Debt, Current Maturities, Total	400
SBA Loans [Member] \| Subsequent Event [Member] \| Agri-Energy [Member]
Debt Instrument, Decrease, Forgiveness	$ 100

Note 9 - Debt - Notes Payable - Other (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Less current portion	$ (1,016)	$ (807)
Long-term portion	212	447
Notes Payable, Other Payables [Member]
Notes payable, other	$ 1,228	1,254
Notes Payable, Other Payables [Member] \| SBA Loans [Member]
Interest rate	1.00%
Notes payable, other	$ 1,006	1,006
Notes Payable, Other Payables [Member] \| Notes Payable, Equipment [Member]
Notes payable, other	$ 222	$ 248
Notes Payable, Other Payables [Member] \| Notes Payable, Equipment [Member] \| Minimum [Member]
Interest rate	4.00%
Notes Payable, Other Payables [Member] \| Notes Payable, Equipment [Member] \| Maximum [Member]
Interest rate	5.00%

Note 9 - Debt - Future Payments for Notes Payable - Other (Details) - Notes Payable, Other Payables [Member] - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
2021 (remaining)	$ 778
2022	356
2023	62
2024	32
Long-term Debt, Total	$ 1,228	$ 1,254

Note 10 - Equity Incentive Plans (Details Textual) - shares	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Jun. 03, 2020
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (in shares)	120,808
Stock Incentive Plan 2010 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)	1,351,858			6,980,074
Stock Incentive Plan 2010 [Member] \| Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (in shares)	121,466
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)			190
Common Stock, Capital Shares Reserved for Future Issuance (in shares)	190
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent	85.00%
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares)	0	0

Note 11 - Stock-based Compensation (Details Textual) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($) $ / shares
Share-based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit (in dollars per share) \| $ / shares	$ 20
Share-based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit (in dollars per share) \| $ / shares	$ 99,300
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value \| $	$ 0
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total \| $	$ 1,900
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	1 year 36 days

Note 11 - Stock-based Compensation - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Stock-based compensation	$ 925	$ 172
Stock Options Issued to Employees and Board Members [Member] \| Research and Development Expense [Member]
Stock-based compensation	125	76
Stock Options Issued to Employees and Board Members [Member] \| Selling, General and Administrative Expenses [Member]
Stock-based compensation	437	260
Restricted Stock [Member] \| Research and Development Expense [Member]
Stock-based compensation	348	(79)
Restricted Stock [Member] \| Selling, General and Administrative Expenses [Member]
Stock-based compensation	$ 15	$ (85)

Note 11 - Stock-based Compensation - Stock Option Award Activity (Details) - $ / shares

3 Months Ended

12 Months Ended

Mar. 31, 2021

Dec. 31, 2020

1,552

Options outstanding, weighted average exercise price (in dollars per share)

^[1]

$ 556.13

Options outstanding, weighted average remaining contractual term (Year)

5 years 131 days

5 years 211 days

Granted (in shares)

Granted, weighted average exercise price (in dollars per share)

^[1]

Canceled or forfeited (in shares)

(35)

Canceled or forfeited, weighted average exercise price (in dollars per share)

^[1]

$ 876

Exercised (in shares)

Exercised, weighted average exercise price (in dollars per share)

^[1]

Options outstanding (in shares)

1,517

1,552

Options outstanding, weighted average exercise price (in dollars per share)

^[1]

$ 548.75

$ 556.13

Options exercisable (in shares)

1,517

Options exercisable, weighted average exercise price (in dollars per share)

^[1]

$ 548.75

Options exercisable, weighted average remaining contractual term (Year)

5 years 131 days

Options vested and expected to vest (in shares)

1,517

Options vested and expected to vest, weighted average exercise price (in dollars per share)

^[1]

$ 548.75

Options vested and expected to vest, weighted average remaining contractual term (Year)

5 years 131 days

[1]	Exercise price of options outstanding range from $20 to $99,300 as of March 31, 2021.

Note 11 - Stock-based Compensation - Non-vested Restricted Stock (Details) - Restricted Stock [Member]	3 Months Ended
	Mar. 31, 2021 $ / shares shares
Non-vested (in shares) \| shares	4,701,556
Non-vested, weighted average grant date fair value (in dollars per share) \| $ / shares	$ 0.79
Granted (in shares) \| shares
Granted, weighted average grant date fair value (in dollars per share) \| $ / shares
Vested (in shares) \| shares
Vested, weighted average grant date fair value (in dollars per share) \| $ / shares
Canceled or forfeited (in shares) \| shares	(120,808)
Canceled or forfeited, weighted average grant date fair value (in dollars per share) \| $ / shares	$ 0.81
Non-vested (in shares) \| shares	4,580,748
Non-vested, weighted average grant date fair value (in dollars per share) \| $ / shares	$ 0.79

Note 12 - Commitments and Contingencies (Details Textual) - Indemnification Agreement [Member] - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Loss Contingency Accrual, Ending Balance		$ 0
Accrual for Environmental Loss Contingencies, Ending Balance	$ 0

Note 13 - Fair Value Measurements (Details Textual) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Notes Payable, Other Payables [Member]
Notes Payable, Fair Value Disclosure	$ 1.2	$ 1.3

Note 13 - Fair Value Measurements - Schedule of Carrying Value and Fair Value by Fair Value Hierarchy of Financial Instruments (Details) - Fair Value, Recurring [Member] - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Warrant [Member]
Derivative liability, fair value	$ 84	$ 31
Warrant [Member] \| Fair Value, Inputs, Level 1 [Member]
Derivative liability, fair value
Warrant [Member] \| Fair Value, Inputs, Level 2 [Member]
Derivative liability, fair value
Warrant [Member] \| Fair Value, Inputs, Level 3 [Member]
Derivative liability, fair value	84	31
Palladium and Finished Goods Inventory [Member]
Inventory, fair value	880
Palladium and Finished Goods Inventory [Member] \| Fair Value, Inputs, Level 1 [Member]
Inventory, fair value	264
Palladium and Finished Goods Inventory [Member] \| Fair Value, Inputs, Level 2 [Member]
Inventory, fair value	616
Palladium and Finished Goods Inventory [Member] \| Fair Value, Inputs, Level 3 [Member]
Inventory, fair value
Corn, Palladium and Finished Goods [Member]
Inventory, fair value		866
Corn, Palladium and Finished Goods [Member] \| Fair Value, Inputs, Level 1 [Member]
Inventory, fair value		235
Corn, Palladium and Finished Goods [Member] \| Fair Value, Inputs, Level 2 [Member]
Inventory, fair value		631
Corn, Palladium and Finished Goods [Member] \| Fair Value, Inputs, Level 3 [Member]
Inventory, fair value

Note 13 - Fair Value Measurements - Schedule of Fair Value Measurements Using Level 3 Inputs (Details) - Derivative Financial Instruments, Liabilities [Member] $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($)
Balance	$ 31
Total loss included in earnings	53
Balance	$ 84

Note 14 - Segments (Details Textual) $ in Thousands	1 Months Ended	3 Months Ended	12 Months Ended
Note 14 - Segments (Details Textual) $ in Thousands	Jan. 31, 2021	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Number of Operating Segments	4
Intercompany Sales		$ 0	$ 100

Note 14 - Segments - Information on Business Segments (Details) - USD ($)
$ in Thousands

3 Months Ended

Mar. 31, 2021

Mar. 31, 2020

Dec. 31, 2020

$ 93

$ 3,825

(9,878)

(7,976)

545

1,149

1,649

5,432

801

Operating Segments [Member] | UNITED STATES

^[1]

608,728

$ 152,099

Operating Segments [Member] | Non-US [Member]

3,750

Intersegment Eliminations [Member]

Gevo [Member] | Operating Segments [Member]

^[2]

(129,487)

(131,971)

125

(5,104)

(2,881)

543

253

Agri-Energy [Member] | Operating Segments [Member]

595,834

152,177

3,700

(2,047)

(4,939)

1,093

1,593

791

Renewable Natural Gas [Member] | Operating Segments [Member]

129,523

131,893

(68)

(156)

5,169

Net-Zero [Member] | Operating Segments [Member]

12,748

(2,659)