Gevo (GEVO) 10-K 17 Mar 20 2019 FY Annual report Financial data

Document And Entity Information

Document And Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Feb. 29, 2020	Jun. 28, 2019
Document Information [Line Items]
Entity Registrant Name	Gevo, Inc.
Entity Central Index Key	0001392380
Trading Symbol	gevo
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	No
Entity Emerging Growth Company	false
Entity Small Business	true
Entity Interactive Data Current	Yes
Entity Common Stock, Shares Outstanding (in shares)		14,619,603
Entity Public Float			$ 20.5
Entity Shell Company	false
Document Type	10-K
Document Period End Date	Dec. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Amendment Flag	false
Title of 12(b) Security	Common Stock, par value $0.01 per share

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands		Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents		$ 16,302	$ 33,734
Accounts receivable		1,135	526
Inventories		3,201	3,166
Prepaid expenses and other current assets		3,590	1,284
Total current assets		24,228	38,710
Property, plant and equipment, net		66,696	67,462
Investment in Juhl		1,500
Deposits and other assets		935	863
Total assets	[1]	93,359	107,035
Current liabilities:
Accounts payable and accrued liabilities		5,678	4,896
2020 Notes (current), net		13,900
2020 Notes embedded derivative liability			394
Notes payable - other (current)		516
Total current liabilities		20,094	5,290
2020 Notes (long-term), net			12,554
Notes payable - other (long-term)		233
Other long-term liabilities		528	404
Total liabilities		20,855	18,248
Commitments and Contingencies (See Note 14)
Stockholders' Equity
Common stock, $0.01 par value per share; 250,000,000 authorized; 14,083,232 and 8,640,583 shares issued and outstanding at December 31, 2019 and 2018, respectively. (See Note 2)		141	86
Additional paid-in capital		530,349	518,027
Accumulated deficit		(457,986)	(429,326)
Total stockholders' equity		72,504	88,787
Total liabilities and stockholders' equity		$ 93,359	$ 107,035
[1]	All other significant non-cash items relate to the activities of Gevo.

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parentheticals) - $ / shares	Dec. 31, 2019	Dec. 31, 2018
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	250,000,000	250,000,000
Common stock shares issued (in shares)	14,083,232	8,640,583
Common stock, shares outstanding (in shares)	14,083,232	8,640,583

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Revenue and cost of goods sold
Revenue from contract with Customer	$ 24,453	$ 32,863
Grant and other revenue	34	25
Total revenues	24,487	32,863
Cost of goods sold	36,733	41,568
Gross loss	(12,246)	(8,705)
Operating expenses
Research and development expense	4,020	5,374
Selling, general and administrative expense	10,085	8,122
Total operating expenses	14,105	13,496
Loss from operations	(26,351)	(22,201)
Other (expense) income
Interest expense	(2,732)	(3,237)
(Loss) on exchange or conversion of debt		(2,202)
Gain from change in fair value of 2020 Notes embedded derivative	394	2,637
Gain (loss) from change in fair value of derivative warrant liability	14	(2,976)
Other income (expense)	15	3
Total other (expense) income	(2,309)	(5,775)
Net loss	$ (28,660)	$ (27,976)
Net loss per share - basic and diluted (in dollars per share)	$ (2.35)	$ (5.74)
Weighted-average number of common shares outstanding - basic and diluted (in shares)	12,177,906	4,876,897
Ethanol Sales and Related Products [Member]
Revenue and cost of goods sold
Revenue from contract with Customer	$ 22,115	$ 31,641
Total revenues	22,115	31,641
Hydrocarbon [Member]
Revenue and cost of goods sold
Revenue from contract with Customer	2,338	1,197
Total revenues	$ 2,338	$ 1,197

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	AOCI Attributable to Parent [Member]	Total
Balance (in shares) at Dec. 31, 2017	1,090,553
Balance at Dec. 31, 2017	$ 11	$ 464,870	$ (401,350)	$ 63,531
Shares issued upon reverse stock split (in shares)	12,261
Issuance of common stock under stock plans, net of taxes (in shares)	119
Issuance of common stock under stock plans, net of taxes
Issuance of common stock, net of issue costs & warrants (in shares)	6,936,930
Issuance of common stock, net of issue costs & warrants	$ 69	38,877		38,946
Non-cash stock-based compensation		571		$ 571
Issuance of common stock upon exercise of warrants (in shares)	300,911			300,911
Issuance of common stock upon exercise of warrants	$ 3	6,165		$ 6,168
Issuance of common stock upon exchange of debt (in shares)	299,809
Issuance of common stock upon exchange of debt	$ 3	7,544		7,547
Net loss			(27,976)	(27,976)
Balance (in shares) at Dec. 31, 2018	8,640,583
Balance at Dec. 31, 2018	$ 86	518,027	(429,326)	88,787
Issuance of common stock under stock plans, net of taxes (in shares)	1,476,961
Issuance of common stock under stock plans, net of taxes	$ 15	(216)		(201)
Issuance of common stock, net of issue costs & warrants (in shares)	3,965,688
Issuance of common stock, net of issue costs & warrants	$ 40	11,317		11,357
Non-cash stock-based compensation		1,221		1,221
Net loss			(28,660)	(28,660)
Balance (in shares) at Dec. 31, 2019	14,083,232
Balance at Dec. 31, 2019	$ 141	$ 530,349	$ (457,986)	$ 72,504

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Operating Activities
Net loss	$ (28,660,000)	$ (27,976,000)
Adjustments to reconcile net loss to net cash used in operating activities:
(Gain) loss from the change in fair value of derivative warrant liability	(14,000)	2,976,000
(Gain) from the change in fair value of the embedded derivative to the 2020 Notes	(394,000)	(2,637,000)
Loss on sale of property, plant and equipment	4,000
Loss on exchange or conversion of debt		2,202,000
Stock-based compensation	1,349,000	683,000
Depreciation and amortization	6,656,000	6,520,000
Non-cash lease expense	48,000
Non-cash interest expense	1,346,000	1,706,000
Other non-cash expenses		6,000
Changes in operating assets and liabilities:
Accounts receivable	(609,000)	528,000
Inventories	(35,000)	1,196,000
Prepaid expenses and other current assets, deposits and other assets	(1,824,000)	(630,000)
Accounts payable, accrued expenses and long-term liabilities	1,294,000	(425,000)
Net cash used in operating activities	(20,839,000)	(15,851,000)
Investing Activities
Acquisitions of property, plant and equipment	(5,989,000)	(2,233,000)
Proceeds from sale of property, plant and equipment	32,000
Investment in Juhl	(1,500,000)
Net cash used in investing activities	(7,457,000)	(2,233,000)
Financing Activities
Payments on secured debt	(292,000)
Debt and equity offering costs	(232,000)	(392,000)
Proceeds from issuance of common stock and common stock warrants	11,589,000	39,394,000
Proceeds from the exercise of warrants		1,263,766
Net settlement of common stock under stock plans	(201,000)
Net cash provided by financing activities	10,864,000	40,265,000
Net (decrease) increase in cash and cash equivalents	(17,432,000)	22,181,000
Cash and cash equivalents, beginning of year	33,734,000	11,553,000
Cash and cash equivalents, end of year	16,302,000	33,734,000
Cash paid for interest	1,391,000	1,945,000
Non-cash purchase of property, plant and equipment	368,000	919,000
Equipment and insurance financed with notes payable	1,041,000
Conversion and exchanges of convertible debt for common stock		3,701,000
Fair value of 2020 Notes embedded derivative upon exchange		2,193,000
Fair value of warrants at issuance and upon exercise, net		$ 4,905,000

Note 1 - Nature of Business and

Note 1 - Nature of Business and Financial Condition	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Business Description and Basis of Presentation [Text Block]	1. Nature of Business zero Gevo’s ability to penetrate the growing low-carbon fuels market depends on the price of oil and the value of abating carbon emissions that would otherwise increase GHG emissions. The Company believes that its proven, patented technology that enables the use of a variety of low-carbon sustainable feedstocks to produce price-competitive, low-carbon products, such as alcohol-to-jet fuel (“ATJ”), gasoline components like isooctane and isobutanol and diesel fuel, yields the potential to generate project and corporate returns that would justify the build-out of a multi-billion-dollar business. Ultimately, the Company believes that the attainment of profitable operations is dependent upon future events, including (i) completing certain capital improvements at Company’s production facility located in Luverne, Minnesota (the "Luverne Facility") to increase the production capacity of renewable jet fuel and isooctane and other related products that can be made from isobutanol; (ii) completing the Company's development activities resulting in commercial production and sales of renewable hydrocarbon products and low-carbon ethanol; (iii) obtaining adequate financing to complete the Company's development activities, including the build out of renewable hydrocarbon capacity; (iv) gaining market acceptance and demand for the Company's products and services; (v) attracting and retaining qualified personnel; and (vi) achieving a level of revenues adequate to support the Company's cost structure. Financial Condition December 31, 2019 2018, $28.7 $28.0 $458.0 December 31, 2019. December 31, 2019 $16.3 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 multiple sales 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 may may no Existing working capital was not one 2019 may not At-the-Market Offering Program. February 2018, 2018 $84.9 August 2019, $10.7 During the year ended December 31, 2019, 3,965,688 $11.5 December 31, 2019, $8.8 From January 1, 2020 February 29, 2020, 425,766 $0.9 February 29, 2019, $7.8 During the year ended December 31, 2018, 6,936,930 $38.9 Reverse Stock Split. June 1, 2018, one twenty June 4, 2018.

Note 2 - Summary of Significant

Note 2 - Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Significant Accounting Policies [Text Block]	2. Principles of Consolidation Basis of Presentation. December 31, 2019. Use of Estimates Reclassifications. not Concentrations of Credit Risk Cash and Cash Equivalents three Accounts Receivable not December 31, 2019 2018, no December 31, 2019, three 57%, 13% 15% December 31, 2018, two 66% 27% Inventories Derivative Instruments 7 Warrants. December 31, 2019 54,989 February 17, 2022. $3.80 $220.00 December 31, 2019. 2013 Accounts Payable and Accrued Liabilities" December 31, 2019 2018 During the year ended December 31, 2018, Common Stock Issued Proceeds Series A Warrants 251 $ 1,054 Series K Warrants 300,660 1,262,712 300,911 $ 1,263,766 Property, Plant and Equipment Impairment of Property, Plant and Equipment may not not not The Company evaluated its Luverne Facility for impairment as of December 31, 2019 2018. • sales price of isobutanol, hydrocarbons, ethanol and by-products such as dried distillers grains; • purchase price of corn; • production levels of isobutanol; • capital and operating costs to produce isobutanol; and • estimated useful life of the primary asset. Factors which can impact these assumptions include, but are not • effectiveness of the Company’s technology to produce isobutanol at targeted margins; • demand for isobutanol and oil prices; and • harvest levels of corn. Based upon the Company’s evaluation at December 31, 2019 2018, not may may Investment in Juhl. September 2019, 1.5 $1.00 Debt Issue Costs Revenue Recognition Ethanol and related products as well as hydrocarbon products are generally shipped free-on-board shipping point. Collectability of revenue is reasonably assured based on historical evidence of collectability between the Company and its customers. In accordance with the Company’s agreements for the marketing and sale of ethanol and related products, commissions due to marketers are deducted from the gross sales price at the time payment was remitted. Ethanol and related products sales are recorded net of commissions and shipping and handling costs. Sales and other taxes that the Company collects concurrent with revenue-producing activities are excluded from revenue. Revenue related to government research grants and cooperative agreements is recognized in the period during which the related costs are incurred, provided that the conditions under the awards have been met and only perfunctory obligations are outstanding. Revenues related to lease agreements are recognized on a straight-line basis over the term of the contract. For the years ended December 31, 2019 2018, 71% 72% 17% 21% December 31, 2019 2018, 16 not Cost of Goods Sold Patents Research and Development third Income Taxes not not Stock-Based Compensation four Net Loss Per Share December 31, 2019 2018 The following table sets forth securities that could potentially dilute the calculation of diluted earnings per share: Year Ended December 31, 201 9 201 8 Warrants to purchase common stock - liability classified 54,989 55,963 Warrants to purchase common stock - equity classified — 6 Convertible 2020 Notes 974,139 1,071,674 Outstanding options to purchase common stock 1,561 2,311 Stock appreciation rights 127,225 132,566 Unvested restricted common stock — 290,300 Total 1,157,914 1,552,820 Recent Accounting Pronouncements Financial Instruments - Credit Losses. Measurement of Credit Losses on Financial Instruments. June 2016, No. 2016 13, Financial Instruments - Credit Losses Measurement of Credits Losses on Financial Instruments 2016 13” not 2016 13 2016 13 December 15, 2022. one two not Adoption of New Accounting Pronouncements Leases . February 2016, No. 2016 02, Leases 2016 02” 2016 02 2016 02 December 15, 2018. 2016 02 January 1, 2019 no no January 1, 2019 As a result of adopting ASU 2016 02, $1.2 January 1, 2019. twelve , January 1, 2019 840, Leases

Note 3 - Revenues From Contract

Note 3 - Revenues From Contracts With Customers and Other Revenues	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Revenue from Contract with Customer [Text Block]	3. The Company’s current and historical revenues have consisted of the following: (a) ethanol sales and related products revenue, net; (b) hydrocarbon revenue; and (c) grant and other revenue, which has historically consisted primarily of revenues from governmental and cooperative research grants. Ethanol sales and related products revenues, net. no Hydrocarbon revenue. no Grant and other revenues. one 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 Year Ended December 31, 201 9 Major Goods/Service Line Revenues from Contracts with Customers Other Revenues Total Ethanol sales and related products, net $ 22,115 $ — $ 22,115 Hydrocarbon revenue 2,338 — 2,338 Grant and other revenue — 34 34 $ 24,453 $ 34 $ 24,487 Timing of Revenue Recognition Goods transferred at a point in time $ 24,453 $ — $ 24,453 Services transferred over time — 34 34 $ 24,453 $ 34 $ 24,487 Year Ended December 31, 201 8 Major Goods/Service Line Revenues from Contracts with Customers Other Revenues Total Ethanol sales and related products, net $ 31,641 $ — $ 31,641 Hydrocarbon revenue 1,197 — 1,197 Grant and other revenue 25 — 25 $ 32,863 $ — $ 32,863 Timing of Revenue Recognition Goods transferred at a point in time $ 32,838 $ — $ 32,838 Services transferred over time 25 — 25 $ 32,863 $ — $ 32,863 Goods transferred at a point-in-time. December 31, 2019 2018, no December 31, 2019 2018, no 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 one three no Services transferred over time. December 31, 2019 2018, no December 31, 2019 2018, no For the years ended December 2019 2018, Contract Assets and Trade Receivables. December 31, 2019 2018, no not no not December 31, 2019 2018.

Note 4 - Leases, Right-to-Use A

Note 4 - Leases, Right-to-Use Assets and Related Liabilities	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Lessee, Operating Leases [Text Block]	4. The Company enters into various arrangements which constitute a lease as defined by ASC 842, Leases, The contracts for the Company are comprised of facility, equipment and transportation 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. The Company elected to adopt both the (a) short-term lease exemption for those leases with initial terms of twelve not no none 12.0% 2020 The Company identified three July 2021, January 2021 June 2020 twelve Upon adoption of ASC 842, Leases, January 1, 2019, $1.2 December 31, 2019, $0.6 twelve "Deposits and other assets". $0.4 "Accounts payable and accrued liabilities" $0.3 "Other long-term liabilities" The Company recognizes rent expense on its operating leases on a straight-line basis. There are two not December 31, 2019 $3.0 December 31, 2019. The following table presents the (a) costs by lease category and (b) other quantitative information relating to the Company’s leases for the year ended December 31, 2019: Lease Cost Operating lease cost $ 1,554 Short-term lease cost 66 Variable lease expense (1) 119 Total lease cost $ 1,739 (1) Represents amounts incurred in excess of minimum payments for common area maintenance and present value discounts. Other Information Cash paid for the measurement of lease liabilities Operating cash flows from operating leases $ 1,554 Right-to-use assets obtained in exchange for new operating lease liabilities $ 280 Weighted-average remaining lease term, operating leases (months) 21.0 Weighted-average discount rate - operating leases 12 % The table below shows the future minimum payments under non-cancelable operating leases at December 31, 2019 ( Year Ending December 31, 2020 $ 684 2021 336 2022 and thereafter — Total 1,020 Less: Amounts representing present value discounts (80 ) Total lease liabilities $ 940

Note 5 - Inventories

Note 5 - Inventories	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Inventory Disclosure [Text Block]	5 . Inventories The following table sets forth the components of the Company’s inventory balances (in thousands): December 31, 201 9 201 8 Raw materials Corn $ 267 $ 29 Enzymes and other inputs 184 204 Finished goods Jet Fuels, Isooctane and Isooctene 571 394 Isobutanol 135 549 Ethanol 93 182 Distillers grains 54 54 Work in process Agri-Energy 254 214 Gevo 122 89 Spare parts 1,521 1,451 Total inventories $ 3,201 $ 3,166 Work in process inventory includes unfinished jet fuel, isooctane and isooctene inventory.

Note 6 - Property, Plant and Eq

Note 6 - Property, Plant and Equipment	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Property, Plant and Equipment Disclosure [Text Block]	6 . Property, Plant and Equipment The following table sets forth the Company’s property, plant and equipment by classification (in thousands): Useful Life December 31, (in years) 2019 2018 Luverne retrofit asset 20 $ 70,820 $ 70,842 Plant machinery and equipment 10 17,413 16,285 Site improvements 10 7,054 7,055 Lab equipment, furniture and fixtures and vehicles 5 6,393 6,574 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 2,542 Computer, office equipment and software 3 to 6 2,034 2,335 Construction in progress — 7,710 3,478 120,087 115,251 Less accumulated depreciation and amortization (53,391 ) (47,789 ) Property, plant and equipment, net $ 66,696 $ 67,462 The Company recorded depreciation and amortization expense related to property, plant and equipment as follows (in thousands): Year Ended December 31, 2019 2018 Cost of goods sold $ 6,282 $ 6,250 Operating expenses 210 267 Total depreciation and amortization $ 6,492 $ 6,517

Note 7 - Embedded Derivatives

Note 7 - Embedded Derivatives	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Discussion of Hybrid Instruments and Embedded Derivatives [Text Block]	7. 2020 In June 2017, 12% 2020 “2020 12.0% 2017 “2017 2020 2020 “2020 2020 three nine 150% ten 2020 Embedded derivatives are separated from the host contract and the 2020 not 2020 2020 one The Company used a binomial lattice model in order to estimate the fair value of the embedded derivative in the 2020 two 2020 2020 2020 150% ten Using this lattice model, the Company valued the embedded derivative using a “with-and-without method”, where the value of the 2020 2020 2020 2020 2020 2020 As of December 31, 2019 2018, $0 $0.4 $0.4 $2.6 December 31, 2019 2018, The following table sets forth the inputs to the lattice model that were used to value the embedded derivatives: December 31, December 31, 201 9 201 8 Stock price $ 2.31 $ 1.96 Conversion Rate $ 67.95 $ 67.95 Conversion Price $ 14.72 $ 14.72 Maturity date March 15, 2020 March 15, 2020 Risk-free interest rate 1.52 % 2.57 % Estimated stock volatility 60 % 150 % Estimated credit spread 27 % 31 % Changes in certain inputs into the lattice model can have a significant impact on changes in the estimated fair value of the embedded featured within the 2020 1 2 3

Note 8 - Accounts Payable and A

Note 8 - Accounts Payable and Accrued Liabilities	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Accounts Payable and Accrued Liabilities Disclosure [Text Block]	8. The following table sets forth the components of the Company’s accounts payable and accrued liabilities in the Consolidated Balance Sheets (in thousands): December 31, 2019 2018 Accrued production fees $ 1,946 $ 1,648 Accounts payable - trade 1,474 1,944 Accrued utilities and supplies 645 344 Other accrued liabilities 1,613 960 Total accounts payable and accrued liabilities $ 5,678 $ 4,896

Note 9 - Debt

Note 9 - Debt	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Debt Disclosure [Text Block]	9. 2020 The following table sets forth information pertaining to the 2020 Principal Amount of 2020 Notes Debt Discount Debt Issue Costs Total 2020 Notes 2020 Notes Embedded Derivative Total 2020 Notes and 2020 Notes Embedded Derivative Balance - December 31, 2017 $ 16,657 $ (2,501 ) $ (665 ) $ 13,491 $ 5,224 $ 18,715 Amortization of debt discount — 1,094 — 1,094 — 1,094 Amortization of debt issue costs — — 309 309 — 309 Paid-in-kind interest 304 — — 304 — 304 Change in fair value of 2020 Notes embedded derivative — — — — (2,637 ) (2,637 ) Conversion of 2020 Notes into common stock (3,186 ) 428 114 (2,644 ) (2,193 ) (4,837 ) Balance - December 31, 2018 13,775 (979 ) (242 ) 12,554 394 12,948 Amortization of debt discount — 856 — 856 — 856 Amortization of debt issue costs — — 212 212 — 212 Paid-in-kind interest 278 — — 278 — 278 Change in fair value of 2020 Notes embedded derivative — — — — (394 ) (394 ) Balance - December 31, 2019 $ 14,053 $ (123 ) $ (30 ) $ 13,900 $ — $ 13,900 On April 19, 2017, “2017 “2017 12.0% 2017 "2017 June 6, 2014, “2017 2017 2017 2017 June 15, 2017), 2017 2020 2017 “2017 June 20, 2017, 2017 2017 2017 The 2020 March 15, 2020 first 2020 12% 2% March 31, June 30, September 30 December 31 2020 2020 Under certain circumstances, the Company had the option to pay a portion of the interest due on the 2020 2020 2020 Additional shares of the Company's common stock could also have become issuable pursuant to the 2020 2020 The 2020 2020 $14.72 0.0679 $1 2020 2020/21 On January 10, 2020, “2020/21 2017 2017 2020/21 2017 2020 $14.1 $14.4 12.0% 2020/21 "2020/21 “2020/21 2020/21 2017 $7.1 2020/21 “2020/21 2020/21 2.0%, 2020/21 2020/21 180 30 January 10, 2020, 2020/21 2017 2020 “2020/21 “2020/21 2020/21 The 2020/21 December 31, 2020, April 1, 2021 March 20, 2020 2020/21 19.99% 2020/21 2020/21 2020/21 December 15, 2020 $7 2020/21 12% 4% March 31, June 30, September 30 December 31 2020/21 2020/21 2020/21 2020/21 2020/21 The 2020/21 2017 2020/21 $2.442 “2020/21 0.4095 $1 2020/21 2017 may 2020/21 2020/21 2020/21 2020/21 10% three Each 2017 not 2020/21 2017 4.99% “4.99% 2017 may, 61 9.99% “9.99% 2020/21 2017 4.99% 9.99% 2020/21 2017 nine six The 2020/21 may 120 2017 2020/21 2017 may 2020/21 The 2020/21 not 2020/21 2020/21 The 2020/21 2020/21 Under certain circumstances, the Company may one 3 2020/21 Notes Payable - Other During the fourth 2019, 3.9% 4.0%, $0.01 August 2020 December 2024. December 31, 2019 Equipment $ 321 Insurance 428 749 Less current portion (516 ) Long-term portion $ 233 Future payments for Notes Payable - Other are as follows (in thousands): Year ending December 31, Amount 2020 $ 516 2021 79 2022 60 2023 62 2024 32 $ 749 2022 In July 2012, $45.0 7.5% July 2022 ( "2022 $40.9 $2.7 $1.4 2022 7.5%, January 1 July 1 first 2018, 39,016 $0.5 2022

Note 10 - Equity Incentive Plan

Note 10 - Equity Incentive Plans	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Stock Incentive Plans Disclosure [Text Block]	10 . Equity Incentive Plans 2006 2006, 2006 “2006 2006 2010 “2010 no 2006 December 31, 2019, no 2006 2010 2010 February 2011, 2010 2010 June 10, 2019, 2010 3,266,661 July 2019, 254,500 August 9, 2018. July 2019, 1,283,032 June 24, 2019 25,581 August 8, 2019, two August 2019, 79,790 December 31, 2019, 1,785,829 2010 Employee Stock Purchase Plan February 2011, January 1 June 30 July 1 December 31 190 190 December 31, 2019 85% first no 2019.

Note 11 - Stock-based Compensat

Note 11 - Stock-based Compensation	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Share-based Payment Arrangement [Text Block]	11 . Stock-Based Compensation Stock-Based Compensation Expense The following table sets forth the Company’s stock-based compensation expense (in thousands): Year Ended December 31, 201 9 201 8 Stock options and ESPP awards Research and development $ — $ 21 Selling, general and administrative — 48 Restricted stock awards Research and development 228 85 Selling, general and administrative 993 417 Stock appreciation rights Research and Development 66 61 Selling, general and administrative 62 51 Total stock-based compensation $ 1,349 $ 683 There were no December 31, 2019 2018. Due to the Company’s limited history of grant activity, the expected life of options granted was estimated using the “simplified method” in accordance with SEC Staff Accounting Bulletin 110, An annual forfeiture rate is estimated at the time of grant for all share-based payment awards, and revised, if necessary, in subsequent periods if the actual forfeiture rate differs from the Company’s estimate. Forfeitures have been estimated by the Company based upon historical and expected forfeiture experience. Estimated forfeiture rates used for the periods presented were from 0% 5%. Stock Option Award Activity December 31, 2019 December 31, 2019 Weighted- Average Weighted- Remaining Average Contractual Aggregate Number of Exercise Term Intrinsic Options Price (years) Value Options outstanding at December 31, 2018 2,313 $ 2,358.44 6.87 $ — Granted — $ — Canceled or forfeited (752 ) $ 5,151.80 Exercised — $ — Options outstanding at December 31, 2019 1,561 $ 928.79 6.56 $ — Options exercisable at December 31, 2019 1,511 $ 1,043.47 6.53 $ — Options vested and expected to vest at December 31, 2019 1,561 $ 928.79 6.56 $ — The aggregate intrinsic values in the table above represent the total pretax intrinsic values (the difference between the closing price of Gevo’s common stock on the last trading day of the 2019 December 31, 2019. As of December 31, 2019, no There is a maximum contractual term of ten No Restricted Stock may two three Non-vested restricted stock awards at December 31, 2019 December 31, 2019 Weighted- Average Number of Grant-Date Shares Fair Value Non-vested at December 31, 2018 290,300 $ 3.45 Granted 1,308,613 $ 1.91 Vested (254,500 ) $ 3.45 Canceled or forfeited (35,800 ) $ 3.45 Non-vested at December 31, 2019 1,308,613 $ 1.91 The total fair value of restricted stock that vested during the years ended December 31, 2019 2018 $0.7 $0.5 December 31, 2019, $1.8 1.5 Stock Appreciation Rights. 132,566 $0.6 December 31, 2018. 2010 The following table sets forth the Black-Scholes option pricing model assumptions and resulting grant date fair value for stock appreciation rights granted during the year ended December 31, 2018 ( no December 31, 2019): December 31, 2018 Grant Date(1) Risk-free interest rate 2.54 % 2.84 % Expected dividend yield — — Expected volatility factor 134.17 % 125.03 % Expected option life (in years) 5.75 5.75 Weighted average value $ 1.65 $ 4.53 ( 1 May 2, 2018 August 9, 2018. $5.23

Note 12 - Income Taxes

Note 12 - Income Taxes	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Income Tax Disclosure [Text Block]	12 . Income Taxes There is no December 31, 2019, $400.3 $375.7 may $3.5 December 31, 2019. 2039 may 382 The following table sets forth the tax effects of temporary differences that give rise to significant portions of the Company’s net deferred tax assets (in thousands): December 31, 201 9 201 8 Deferred tax assets, net: Net operating loss carryforwards $ 109,813 $ 103,612 Research and other credits 3,482 3,482 Operating lease assets (170 ) — Operating lease liabilities 198 — Other temporary differences 4,851 3,760 Deferred tax assets 118,175 110,854 Valuation allowance (118,175 ) (110,854 ) Net deferred tax assets $ — $ — The Company recognizes uncertain tax positions net, against any operating losses or applicable research credits as they arise. Currently, there are no December 31, 2019. December 31, 2019 2018, not not The following table sets forth reconciling items from income tax computed at the statutory federal rate: Year Ended December 31, 201 9 201 8 Federal income tax at statutory rate 21.0 % 21.0 % State income taxes, net of federal benefits 7.0 % 6.2 % Impact of change in statutory tax rates (0.2 %) (8.8 %) Permanent deductions (0.1 %) (3.7 %) Valuation allowance (27.7 %) (14.7 %) Effective tax rate — % — % Accounting literature regarding liabilities for unrecognized tax benefits provides guidance for the recognition and measurement in financial statements of uncertain tax positions taken or expected to be taken in a tax return. The Company’s evaluation was performed for the tax periods from inception to December 31, 2019. December 31, 2015 2019. The Company may no

Note 13 - Employee Benefit Plan

Note 13 - Employee Benefit Plan	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Employee Benefit Plan [Text Block]	13 . Employee Benefit Plan The Company’s employees participate in the Gevo, Inc. 401 “401 401 three 401 may not may 401 not December 31, 2019 2018.

Note 14 - Commitments and Conti

Note 14 - Commitments and Contingencies	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Commitments and Contingencies Disclosure [Text Block]	14 . Commitments and Contingencies Legal Matters. may not Indemnifications may December 31, 2019 2018, not 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 may No Environmental Liabilities No December 31, 2019.

Note 15 - Fair Value Measuremen

Note 15 - Fair Value Measurements and Fair Value of Financial Instruments	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Fair Value Disclosures [Text Block]	1 5 . Fair Value Measurements and Fair Value of Financial Instruments 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 Level 1 Level 2 1, 2 Level 3 no These tables present the carrying value and fair value, by fair value hierarchy, of the Company's financial instruments at December 31, 2019 2018, $0.7 December 31, 2019. Fair Value Measurements at December 31, 201 9 Fair Value at December 31, 201 9 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 $ 8 $ — $ — $ 8 Nonrecurring Corn and finished goods inventory $ 940 $ 267 $ 673 $ — Fair Value Measurements at December 31, 201 8 Fair Value at December 31, 201 8 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 $ 22 $ — $ — $ 22 2020 Notes Embedded Derivative Liability 394 — — 394 Total Recurring Fair Value Measurements $ 416 $ — $ — $ 416 Nonrecurring Corn and finished goods inventory $ 1,047 $ 29 $ 1,018 $ — Fair Value Measurements Using Significant Unobservable Inputs (Level 3) (in thousands) Derivative Warrant Liability 2020 Embedded Derivative Liability Balance, December 31, 2018 $ 22 $ 394 Total (gains) or losses for the period included in earnings (14 ) (394 ) Purchases — — Balance, December 31, 2019 $ 8 $ — There were no 1 2 no 3 no 3 December 31, 2019. The Company believes that the fair value of its accounts receivable and accounts payable approximate its book value due to their short-term nature. Fair Value Methodology Inventories. 1 2 2020 2020 $13.5 June 20, 2017, 2017 2020 2020 $13.9 $12.6 December 31, 2019 2018, 2020 $0 December 31, 2019 3 7, 2020 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.

Note 16 - Segments

Note 16 - Segments	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Segment Reporting Disclosure [Text Block]	16 . Segments The Company has determined that it has two Gevo Segment Gevo Development/Agri-Energy 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., Gevo Development, LLC and Agri-Energy, LLC. The Company organizes its business segments based on the nature of the products and services offered through each of its consolidated legal entities. All revenue is earned and all assets are held in the U.S. Year Ended December 31, 201 9 201 8 (In thousands) Revenues from external customers Gevo $ 2,338 $ 1,222 Gevo Development / Agri-Energy 22,149 31,641 Consolidated $ 24,487 $ 32,863 Loss from operations Gevo $ (12,360 ) $ (11,552 ) Gevo Development / Agri-Energy (13,991 ) (10,649 ) Consolidated $ (26,351 ) $ (22,201 ) Interest expense Gevo $ 2,732 $ 3,237 Gevo Development / Agri-Energy — — Consolidated $ 2,732 $ 3,237 Depreciation and amortization expense Gevo $ 210 $ 269 Gevo Development / Agri-Energy 6,446 6,251 Consolidated $ 6,656 $ 6,520 Acquisitions of plant, property and equipment Gevo $ 130 $ 27 Gevo Development / Agri-Energy 6,367 3,096 Consolidated $ 6,497 $ 3,123 Revenue by geographic area United States $ 22,149 $ 31,641 Other 2,338 1,222 Consolidated $ 24,487 $ 32,863 December 31, 201 9 201 8 Total assets Gevo $ 91,861 $ 105,379 Gevo Development / Agri-Energy 143,349 140,982 Intercompany eliminations (1) (141,851 ) (139,326 ) Consolidated (2) $ 93,359 $ 107,035 ( 1 Includes intercompany sales of $0.4 $0.1 December 31, 2019 2018, ( 2 All other significant non-cash items relate to the activities of Gevo.

Significant Accounting Policies

Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2019
Accounting Policies [Abstract]
Nature of Business [Policy Text Block]	Nature of Business zero Gevo’s ability to penetrate the growing low-carbon fuels market depends on the price of oil and the value of abating carbon emissions that would otherwise increase GHG emissions. The Company believes that its proven, patented technology that enables the use of a variety of low-carbon sustainable feedstocks to produce price-competitive, low-carbon products, such as alcohol-to-jet fuel (“ATJ”), gasoline components like isooctane and isobutanol and diesel fuel, yields the potential to generate project and corporate returns that would justify the build-out of a multi-billion-dollar business. Ultimately, the Company believes that the attainment of profitable operations is dependent upon future events, including (i) completing certain capital improvements at Company’s production facility located in Luverne, Minnesota (the "Luverne Facility") to increase the production capacity of renewable jet fuel and isooctane and other related products that can be made from isobutanol; (ii) completing the Company's development activities resulting in commercial production and sales of renewable hydrocarbon products and low-carbon ethanol; (iii) obtaining adequate financing to complete the Company's development activities, including the build out of renewable hydrocarbon capacity; (iv) gaining market acceptance and demand for the Company's products and services; (v) attracting and retaining qualified personnel; and (vi) achieving a level of revenues adequate to support the Company's cost structure.
Financial Condition [Policy Text Block]	Financial Condition December 31, 2019 2018, $28.7 $28.0 $458.0 December 31, 2019. December 31, 2019 $16.3 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 multiple sales 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 may may no Existing working capital was not one 2019 may not
At-the-market Offering Program, Policy [Policy Text Block]	At-the-Market Offering Program. February 2018, 2018 $84.9 August 2019, $10.7 During the year ended December 31, 2019, 3,965,688 $11.5 December 31, 2019, $8.8 From January 1, 2020 February 29, 2020, 425,766 $0.9 February 29, 2019, $7.8 During the year ended December 31, 2018, 6,936,930 $38.9
Reverse Stock Split [Policy Text Block]	Reverse Stock Split. June 1, 2018, one twenty June 4, 2018.
Consolidation, Policy [Policy Text Block]	Principles of Consolidation
Basis of Accounting, Policy [Policy Text Block]	Basis of Presentation. December 31, 2019.
Use of Estimates, Policy [Policy Text Block]	Use of Estimates
Reclassification, Policy [Policy Text Block]	Reclassifications. not
Concentration Risk, Credit Risk, Policy [Policy Text Block]	Concentrations of Credit Risk
Cash and Cash Equivalents, Policy [Policy Text Block]	Cash and Cash Equivalents three
Receivable [Policy Text Block]	Accounts Receivable not December 31, 2019 2018, no December 31, 2019, three 57%, 13% 15% December 31, 2018, two 66% 27%
Inventory, Policy [Policy Text Block]	Inventories
Derivatives, Policy [Policy Text Block]	Derivative Instruments 7
Warrants [Policy Text Block]	Warrants. December 31, 2019 54,989 February 17, 2022. $3.80 $220.00 December 31, 2019. 2013 Accounts Payable and Accrued Liabilities" December 31, 2019 2018 During the year ended December 31, 2018, Common Stock Issued Proceeds Series A Warrants 251 $ 1,054 Series K Warrants 300,660 1,262,712 300,911 $ 1,263,766
Property, Plant and Equipment, Policy [Policy Text Block]	Property, Plant and Equipment
Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block]	Property, Plant and Equipment Impairment of Property, Plant and Equipment may not not not The Company evaluated its Luverne Facility for impairment as of December 31, 2019 2018. • sales price of isobutanol, hydrocarbons, ethanol and by-products such as dried distillers grains; • purchase price of corn; • production levels of isobutanol; • capital and operating costs to produce isobutanol; and • estimated useful life of the primary asset. Factors which can impact these assumptions include, but are not • effectiveness of the Company’s technology to produce isobutanol at targeted margins; • demand for isobutanol and oil prices; and • harvest levels of corn. Based upon the Company’s evaluation at December 31, 2019 2018, not may may
Investment, Policy [Policy Text Block]	Investment in Juhl. September 2019, 1.5 $1.00
Debt, Policy [Policy Text Block]	Debt Issue Costs
Revenue [Policy Text Block]	Revenue Recognition Ethanol and related products as well as hydrocarbon products are generally shipped free-on-board shipping point. Collectability of revenue is reasonably assured based on historical evidence of collectability between the Company and its customers. In accordance with the Company’s agreements for the marketing and sale of ethanol and related products, commissions due to marketers are deducted from the gross sales price at the time payment was remitted. Ethanol and related products sales are recorded net of commissions and shipping and handling costs. Sales and other taxes that the Company collects concurrent with revenue-producing activities are excluded from revenue. Revenue related to government research grants and cooperative agreements is recognized in the period during which the related costs are incurred, provided that the conditions under the awards have been met and only perfunctory obligations are outstanding. Revenues related to lease agreements are recognized on a straight-line basis over the term of the contract. For the years ended December 31, 2019 2018, 71% 72% 17% 21% December 31, 2019 2018, 16 not
Cost of Goods and Service [Policy Text Block]	Cost of Goods Sold
Goodwill and Intangible Assets, Intangible Assets, Policy [Policy Text Block]	Patents
Research and Development Expense, Policy [Policy Text Block]	Research and Development third
Income Tax, Policy [Policy Text Block]	Income Taxes not not
Share-based Compensation [Policy Text Block]	Stock-Based Compensation four
Earnings Per Share, Policy [Policy Text Block]	Net Loss Per Share December 31, 2019 2018 The following table sets forth securities that could potentially dilute the calculation of diluted earnings per share: Year Ended December 31, 201 9 201 8 Warrants to purchase common stock - liability classified 54,989 55,963 Warrants to purchase common stock - equity classified — 6 Convertible 2020 Notes 974,139 1,071,674 Outstanding options to purchase common stock 1,561 2,311 Stock appreciation rights 127,225 132,566 Unvested restricted common stock — 290,300 Total 1,157,914 1,552,820
New Accounting Pronouncements, Policy [Policy Text Block]	Recent Accounting Pronouncements Financial Instruments - Credit Losses. Measurement of Credit Losses on Financial Instruments. June 2016, No. 2016 13, Financial Instruments - Credit Losses Measurement of Credits Losses on Financial Instruments 2016 13” not 2016 13 2016 13 December 15, 2022. one two not Adoption of New Accounting Pronouncements Leases . February 2016, No. 2016 02, Leases 2016 02” 2016 02 2016 02 December 15, 2018. 2016 02 January 1, 2019 no no January 1, 2019 As a result of adopting ASU 2016 02, $1.2 January 1, 2019. twelve , January 1, 2019 840, Leases

Note 2 - Summary of Significa_2

Note 2 - Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2019
Notes Tables
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]	Common Stock Issued Proceeds Series A Warrants 251 $ 1,054 Series K Warrants 300,660 1,262,712 300,911 $ 1,263,766
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]	Year Ended December 31, 201 9 201 8 Warrants to purchase common stock - liability classified 54,989 55,963 Warrants to purchase common stock - equity classified — 6 Convertible 2020 Notes 974,139 1,071,674 Outstanding options to purchase common stock 1,561 2,311 Stock appreciation rights 127,225 132,566 Unvested restricted common stock — 290,300 Total 1,157,914 1,552,820

Note 3 - Revenues From Contra_2

Note 3 - Revenues From Contracts With Customers and Other Revenues (Tables)	12 Months Ended
	Dec. 31, 2019
Notes Tables
Disaggregation of Revenue [Table Text Block]	Year Ended December 31, 201 9 Major Goods/Service Line Revenues from Contracts with Customers Other Revenues Total Ethanol sales and related products, net $ 22,115 $ — $ 22,115 Hydrocarbon revenue 2,338 — 2,338 Grant and other revenue — 34 34 $ 24,453 $ 34 $ 24,487 Timing of Revenue Recognition Goods transferred at a point in time $ 24,453 $ — $ 24,453 Services transferred over time — 34 34 $ 24,453 $ 34 $ 24,487 Year Ended December 31, 201 8 Major Goods/Service Line Revenues from Contracts with Customers Other Revenues Total Ethanol sales and related products, net $ 31,641 $ — $ 31,641 Hydrocarbon revenue 1,197 — 1,197 Grant and other revenue 25 — 25 $ 32,863 $ — $ 32,863 Timing of Revenue Recognition Goods transferred at a point in time $ 32,838 $ — $ 32,838 Services transferred over time 25 — 25 $ 32,863 $ — $ 32,863

Note 4 - Leases, Right-to-Use_2

Note 4 - Leases, Right-to-Use Assets and Related Liabilities (Tables)	12 Months Ended
	Dec. 31, 2019
Notes Tables
Lease, Cost [Table Text Block]	Lease Cost Operating lease cost $ 1,554 Short-term lease cost 66 Variable lease expense (1) 119 Total lease cost $ 1,739 (1) Represents amounts incurred in excess of minimum payments for common area maintenance and present value discounts. Other Information Cash paid for the measurement of lease liabilities Operating cash flows from operating leases $ 1,554 Right-to-use assets obtained in exchange for new operating lease liabilities $ 280 Weighted-average remaining lease term, operating leases (months) 21.0 Weighted-average discount rate - operating leases 12 %
Lessee, Operating Lease, Liability, Maturity [Table Text Block]	Year Ending December 31, 2020 $ 684 2021 336 2022 and thereafter — Total 1,020 Less: Amounts representing present value discounts (80 ) Total lease liabilities $ 940

Note 5 - Inventories (Tables)

Note 5 - Inventories (Tables)	12 Months Ended
	Dec. 31, 2019
Notes Tables
Schedule of Inventory, Current [Table Text Block]	December 31, 201 9 201 8 Raw materials Corn $ 267 $ 29 Enzymes and other inputs 184 204 Finished goods Jet Fuels, Isooctane and Isooctene 571 394 Isobutanol 135 549 Ethanol 93 182 Distillers grains 54 54 Work in process Agri-Energy 254 214 Gevo 122 89 Spare parts 1,521 1,451 Total inventories $ 3,201 $ 3,166

Note 6 - Property, Plant and _2

Note 6 - Property, Plant and Equipment (Tables)	12 Months Ended
	Dec. 31, 2019
Notes Tables
Property, Plant and Equipment [Table Text Block]	Useful Life December 31, (in years) 2019 2018 Luverne retrofit asset 20 $ 70,820 $ 70,842 Plant machinery and equipment 10 17,413 16,285 Site improvements 10 7,054 7,055 Lab equipment, furniture and fixtures and vehicles 5 6,393 6,574 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 2,542 Computer, office equipment and software 3 to 6 2,034 2,335 Construction in progress — 7,710 3,478 120,087 115,251 Less accumulated depreciation and amortization (53,391 ) (47,789 ) Property, plant and equipment, net $ 66,696 $ 67,462
Schedule of Depreciation and Amortization Expense [Table Text Block]	Year Ended December 31, 2019 2018 Cost of goods sold $ 6,282 $ 6,250 Operating expenses 210 267 Total depreciation and amortization $ 6,492 $ 6,517

Note 7 - Embedded Derivatives (

Note 7 - Embedded Derivatives (Tables)	12 Months Ended
	Dec. 31, 2019
Notes Tables
Defined Benefit Plan, Assumptions [Table Text Block]	December 31, December 31, 201 9 201 8 Stock price $ 2.31 $ 1.96 Conversion Rate $ 67.95 $ 67.95 Conversion Price $ 14.72 $ 14.72 Maturity date March 15, 2020 March 15, 2020 Risk-free interest rate 1.52 % 2.57 % Estimated stock volatility 60 % 150 % Estimated credit spread 27 % 31 %

Note 8 - Accounts Payable and_2

Note 8 - Accounts Payable and Accrued Liabilities (Tables)	12 Months Ended
	Dec. 31, 2019
Notes Tables
Schedule of Accounts Payable and Accrued Liabilities [Table Text Block]	December 31, 2019 2018 Accrued production fees $ 1,946 $ 1,648 Accounts payable - trade 1,474 1,944 Accrued utilities and supplies 645 344 Other accrued liabilities 1,613 960 Total accounts payable and accrued liabilities $ 5,678 $ 4,896

Note 9 - Debt (Tables)

Note 9 - Debt (Tables)	12 Months Ended
	Dec. 31, 2019
Notes Tables
Schedule of Debt [Table Text Block]	Principal Amount of 2020 Notes Debt Discount Debt Issue Costs Total 2020 Notes 2020 Notes Embedded Derivative Total 2020 Notes and 2020 Notes Embedded Derivative Balance - December 31, 2017 $ 16,657 $ (2,501 ) $ (665 ) $ 13,491 $ 5,224 $ 18,715 Amortization of debt discount — 1,094 — 1,094 — 1,094 Amortization of debt issue costs — — 309 309 — 309 Paid-in-kind interest 304 — — 304 — 304 Change in fair value of 2020 Notes embedded derivative — — — — (2,637 ) (2,637 ) Conversion of 2020 Notes into common stock (3,186 ) 428 114 (2,644 ) (2,193 ) (4,837 ) Balance - December 31, 2018 13,775 (979 ) (242 ) 12,554 394 12,948 Amortization of debt discount — 856 — 856 — 856 Amortization of debt issue costs — — 212 212 — 212 Paid-in-kind interest 278 — — 278 — 278 Change in fair value of 2020 Notes embedded derivative — — — — (394 ) (394 ) Balance - December 31, 2019 $ 14,053 $ (123 ) $ (30 ) $ 13,900 $ — $ 13,900
Schedule of Long-term Debt Instruments [Table Text Block]	Equipment $ 321 Insurance 428 749 Less current portion (516 ) Long-term portion $ 233
Schedule of Maturities of Long-term Debt [Table Text Block]	Year ending December 31, Amount 2020 $ 516 2021 79 2022 60 2023 62 2024 32 $ 749

Note 11 - Stock-based Compens_2

Note 11 - Stock-based Compensation (Tables)	12 Months Ended
	Dec. 31, 2019
Notes Tables
Share-based Payment Arrangement, Cost by Plan [Table Text Block]	Year Ended December 31, 201 9 201 8 Stock options and ESPP awards Research and development $ — $ 21 Selling, general and administrative — 48 Restricted stock awards Research and development 228 85 Selling, general and administrative 993 417 Stock appreciation rights Research and Development 66 61 Selling, general and administrative 62 51 Total stock-based compensation $ 1,349 $ 683
Share-based Payment Arrangement, Option, Activity [Table Text Block]	Weighted- Average Weighted- Remaining Average Contractual Aggregate Number of Exercise Term Intrinsic Options Price (years) Value Options outstanding at December 31, 2018 2,313 $ 2,358.44 6.87 $ — Granted — $ — Canceled or forfeited (752 ) $ 5,151.80 Exercised — $ — Options outstanding at December 31, 2019 1,561 $ 928.79 6.56 $ — Options exercisable at December 31, 2019 1,511 $ 1,043.47 6.53 $ — Options vested and expected to vest at December 31, 2019 1,561 $ 928.79 6.56 $ —
Schedule of Nonvested Share Activity [Table Text Block]	Weighted- Average Number of Grant-Date Shares Fair Value Non-vested at December 31, 2018 290,300 $ 3.45 Granted 1,308,613 $ 1.91 Vested (254,500 ) $ 3.45 Canceled or forfeited (35,800 ) $ 3.45 Non-vested at December 31, 2019 1,308,613 $ 1.91
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]	December 31, 2018 Grant Date(1) Risk-free interest rate 2.54 % 2.84 % Expected dividend yield — — Expected volatility factor 134.17 % 125.03 % Expected option life (in years) 5.75 5.75 Weighted average value $ 1.65 $ 4.53

Note 12 - Income Taxes (Tables)

Note 12 - Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2019
Notes Tables
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]	December 31, 201 9 201 8 Deferred tax assets, net: Net operating loss carryforwards $ 109,813 $ 103,612 Research and other credits 3,482 3,482 Operating lease assets (170 ) — Operating lease liabilities 198 — Other temporary differences 4,851 3,760 Deferred tax assets 118,175 110,854 Valuation allowance (118,175 ) (110,854 ) Net deferred tax assets $ — $ —
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]	Year Ended December 31, 201 9 201 8 Federal income tax at statutory rate 21.0 % 21.0 % State income taxes, net of federal benefits 7.0 % 6.2 % Impact of change in statutory tax rates (0.2 %) (8.8 %) Permanent deductions (0.1 %) (3.7 %) Valuation allowance (27.7 %) (14.7 %) Effective tax rate — % — %

Note 15 - Fair Value Measurem_2

Note 15 - Fair Value Measurements and Fair Value of Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2019
Notes Tables
Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]	Fair Value Measurements at December 31, 201 9 Fair Value at December 31, 201 9 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 $ 8 $ — $ — $ 8 Nonrecurring Corn and finished goods inventory $ 940 $ 267 $ 673 $ — Fair Value Measurements at December 31, 201 8 Fair Value at December 31, 201 8 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 $ 22 $ — $ — $ 22 2020 Notes Embedded Derivative Liability 394 — — 394 Total Recurring Fair Value Measurements $ 416 $ — $ — $ 416 Nonrecurring Corn and finished goods inventory $ 1,047 $ 29 $ 1,018 $ —
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]	Fair Value Measurements Using Significant Unobservable Inputs (Level 3) (in thousands) Derivative Warrant Liability 2020 Embedded Derivative Liability Balance, December 31, 2018 $ 22 $ 394 Total (gains) or losses for the period included in earnings (14 ) (394 ) Purchases — — Balance, December 31, 2019 $ 8 $ —

Note 16 - Segments (Tables)

Note 16 - Segments (Tables)	12 Months Ended
	Dec. 31, 2019
Notes Tables
Schedule of Segment Reporting Information, by Segment [Table Text Block]	Year Ended December 31, 201 9 201 8 (In thousands) Revenues from external customers Gevo $ 2,338 $ 1,222 Gevo Development / Agri-Energy 22,149 31,641 Consolidated $ 24,487 $ 32,863 Loss from operations Gevo $ (12,360 ) $ (11,552 ) Gevo Development / Agri-Energy (13,991 ) (10,649 ) Consolidated $ (26,351 ) $ (22,201 ) Interest expense Gevo $ 2,732 $ 3,237 Gevo Development / Agri-Energy — — Consolidated $ 2,732 $ 3,237 Depreciation and amortization expense Gevo $ 210 $ 269 Gevo Development / Agri-Energy 6,446 6,251 Consolidated $ 6,656 $ 6,520 Acquisitions of plant, property and equipment Gevo $ 130 $ 27 Gevo Development / Agri-Energy 6,367 3,096 Consolidated $ 6,497 $ 3,123 Revenue by geographic area United States $ 22,149 $ 31,641 Other 2,338 1,222 Consolidated $ 24,487 $ 32,863 December 31, 201 9 201 8 Total assets Gevo $ 91,861 $ 105,379 Gevo Development / Agri-Energy 143,349 140,982 Intercompany eliminations (1) (141,851 ) (139,326 ) Consolidated (2) $ 93,359 $ 107,035

Note 1 - Nature of Business a_2

Note 1 - Nature of Business and Financial Condition (Details Textual) $ in Thousands	Jun. 01, 2018	Aug. 31, 2019USD ($)	Feb. 28, 2018USD ($)	Feb. 29, 2020USD ($)shares	Dec. 31, 2019USD ($)shares	Dec. 31, 2018USD ($)shares
Net Income (Loss) Attributable to Parent, Total					$ (28,660)	$ (27,976)
Retained Earnings (Accumulated Deficit), Ending Balance					(457,986)	(429,326)
Cash and Cash Equivalents, at Carrying Value, Ending Balance					16,302	33,734
Proceeds from Issuance of Common Stock					$ 11,589	$ 39,394
Reverse Stock Split [Member]
Stockholders' Equity Note, Stock Split, Conversion Ratio	20
At-the-market Offering [Member]
Increase (Decrease) in At-the-Market Offering of Stock		$ 10,700	$ 84,900
Stock Issued During Period, Shares, New Issues | shares					3,965,688	6,936,930
Proceeds from Issuance of Common Stock					$ 11,500	$ 38,900
Offering of Stock, Remaining Capacity, Values					$ 8,800
At-the-market Offering [Member] | Subsequent Event [Member]
Stock Issued During Period, Shares, New Issues | shares				425,766
Proceeds from Issuance of Common Stock				$ 900
Offering of Stock, Remaining Capacity, Shares | shares				7,800,000

Note 2 - Summary of Significa_3

Note 2 - Summary of Significant Accounting Policies (Details Textual) $ / shares in Units, $ in Thousands	1 Months Ended	12 Months Ended
	Sep. 30, 2019$ / sharesshares	Dec. 31, 2019USD ($)$ / sharesshares	Dec. 31, 2018USD ($)	Jan. 01, 2019USD ($)
Accounts Receivable, Allowance for Credit Loss, Ending Balance | $		$ 0	$ 0
Class of Warrant or Right, Outstanding | shares		54,989
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		4 years
Accounting Standards Update 2016-02 [Member]
Operating Lease, Right-of-Use Asset | $				$ 1,200
Operating Lease, Liability, Total | $				$ 1,200
Series A preferred stock of Juhl Clean Energy Assets, Inc. [Member]
Number of Securities Purchased | shares	1,500,000
Equity Securities, Purchase Price | $ / shares	$ 1
Minimum [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares		$ 3.80
Maximum [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares		$ 220
Customer Concentration Risk [Member] | Accounts Receivable [Member]
Number of Customers		3	2
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Eco-Energy, LLC [Member]
Concentration Risk, Percentage		57.00%	66.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Purina Animal Nutrition, LLC [Member]
Concentration Risk, Percentage		13.00%	27.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | HCS Group GmbH [Member]
Concentration Risk, Percentage		15.00%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Eco-Energy, LLC [Member]
Concentration Risk, Percentage		71.00%	72.00%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Purina Animal Nutrition, LLC [Member]
Concentration Risk, Percentage		17.00%	21.00%

Note 2 - Summary of Significa_4

Note 2 - Summary of Significant Accounting Policies - Warrants (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Common Stock Issued (in shares)		300,911
Proceeds		$ 1,263,766
Series A Warrants [Member]
Common Stock Issued (in shares)		251
Proceeds		$ 1,054
Series K Warrants [Member]
Common Stock Issued (in shares)		300,660
Proceeds		$ 1,262,712

Note 2 - Summary of Significa_5

Note 2 - Summary of Significant Accounting Policies - Securities Potentially Dilute Calculation of Diluted Earnings Per Share (Details) - shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Antidilutive securities (in shares)	1,157,914	1,552,820
Warrants to Purchase Common Stock - Liability Classified [Member]
Antidilutive securities (in shares)	54,989	55,963
Warrants to Purchase Common Stock - Equity Classified [Member]
Antidilutive securities (in shares)		6
Convertible 2017 Notes [Member]
Antidilutive securities (in shares)	974,139	1,071,674
Share-based Payment Arrangement, Option [Member]
Antidilutive securities (in shares)	1,561	2,311
Stock Appreciation Rights (SARs) [Member]
Antidilutive securities (in shares)	127,225	132,566
Restricted Stock [Member]
Antidilutive securities (in shares)		290,300

Note 3 - Revenues From Contra_3

Note 3 - Revenues From Contracts With Customers and Other Revenues (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Revenue from Contract with Customer, Including Assessed Tax	$ 24,453	$ 32,863
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	24,453	32,838
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		25
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

Note 3 - Revenues from Contra_4

Note 3 - Revenues from Contracts with Customers and Other Revenues - Disaggregated Revenues (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Revenue from Contract with Customer, Including Assessed Tax	$ 24,453	$ 32,863
Other revenues	34
Total revenues	24,487	32,863
Transferred at Point in Time [Member]
Revenue from Contract with Customer, Including Assessed Tax	24,453	32,838
Other revenues
Total revenues	24,453	32,838
Transferred over Time [Member]
Revenue from Contract with Customer, Including Assessed Tax		25
Other revenues	34
Total revenues	34	25
Ethanol Sales and Related Products [Member]
Revenue from Contract with Customer, Including Assessed Tax	22,115	31,641
Other revenues
Total revenues	22,115	31,641
Hydrocarbon [Member]
Revenue from Contract with Customer, Including Assessed Tax	2,338	1,197
Other revenues
Total revenues	2,338	1,197
Grant and Other [Member]
Revenue from Contract with Customer, Including Assessed Tax		25
Other revenues	34
Total revenues	$ 34	$ 25

Note 4 - Leases, Right-to-Use_3

Note 4 - Leases, Right-to-Use Assets and Related Liabilities (Details Textual) $ in Thousands	Dec. 31, 2019USD ($)	Jan. 01, 2019USD ($)
Leases Containing Variable Payments	0
Leases Containing Extension or Termination Options	0
Lessee, Operating Lease, Discount Rate	12.00%
Lessee, Operating Lease, Lease Not yet Commenced, Amount	2
Lessee, Operating Lease, Right-of-Use Asset, Not yet Commenced, Fair Value	$ 3,000
Lessee, Operating Lease, Liability, Not yet Commenced, Fair Value	3,000
Deposits and Other Assets [Member]
Operating Lease, Right-of-Use Asset	600
Accounts Payable and Accrued Liabilities [Member]
Operating Lease, Liability, Total	400
Other Noncurrent Liabilities [Member]
Operating Lease, Liability, Total	$ 300
Accounting Standards Update 2016-02 [Member]
Operating Lease, Right-of-Use Asset		$ 1,200
Operating Lease, Liability, Total		$ 1,200

Note 4 - Leases, Right-to-Use_4

Note 4 - Leases, Right-to-Use Assets and Related Liabilities - Lease Costs (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)
Operating lease cost	$ 1,554
Short-term lease cost	66
Variable lease expense (1)	119	[1]
Total lease cost	1,739
Operating cash flows from operating leases	1,554
Right-to-use assets obtained in exchange for new operating lease liabilities	$ 280
Weighted-average remaining lease term, operating leases (months) (Month)	1 year 270 days
Weighted-average discount rate - operating leases	12.00%
[1]	Represents amounts incurred in excess of minimum payments for common area maintenance and present value discounts.

Note 4 - Leases, Right-to-Use_5

Note 4 - Leases, Right-to-Use Assets and Related Liabilities - Future Minimum Payments Under Non-cancelable Operating Leases (Details) $ in Thousands	Dec. 31, 2019USD ($)
2020	$ 684
2021	336
2022 and thereafter
Total	1,020
Less: Amounts representing present value discounts	(80)
Accounts Payable, Accrued Liabilities and Other Noncurrent Liabilities [Member]
Total lease liabilities	$ 940

Note 5 - Inventories - Componen

Note 5 - Inventories - Components of Inventory Balances (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Spare parts	$ 1,521	$ 1,451
Total inventories	3,201	3,166
Corn [Member]
Raw materials	267	29
Enzymes and Other Inputs [Member]
Raw materials	184	204
Jet Fuels, Isooctane and Isooctene [Member]
Finished goods	571	394
Isobutanol [Member]
Finished goods	135	549
Ethanol [Member]
Finished goods	93	182
Distiller's Grains [Member]
Finished goods	54	54
Agri-Energy [Member]
Work in process	254	214
Gevo [Member]
Work in process	$ 122	$ 89

Note 6 - Property, Plant and _3

Note 6 - Property, Plant and Equipment - Property, Plant and Equipment by Classification (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Property, plant, and equipment, gross	$ 120,087	$ 115,251
Less accumulated depreciation and amortization	(53,391)	(47,789)
Property, plant and equipment, net	$ 66,696	67,462
Retrofit Assets [Member]
Property, plant and equipment, useful life (Year)	20 years
Property, plant, and equipment, gross	$ 70,820	70,842
Machinery and Equipment [Member]
Property, plant and equipment, useful life (Year)	10 years
Property, plant, and equipment, gross	$ 17,413	16,285
Site Improvement [Member]
Property, plant and equipment, useful life (Year)	10 years
Property, plant, and equipment, gross	$ 7,054	7,055
Lab Equipment, Furniture and Fixtures, and Vehicles [Member]
Property, plant and equipment, useful life (Year)	5 years
Property, plant, and equipment, gross	$ 6,393	6,574
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	2,542
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	$ 2,034	2,335
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	$ 7,710	$ 3,478

Note 6 - Property, Plant and _4

Note 6 - Property, Plant and Equipment - Depreciation and Amortization Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Depreciation and amortization	$ 6,492	$ 6,517
Cost of Sales [Member]
Depreciation and amortization	6,282	6,250
Operating Expense [Member]
Depreciation and amortization	$ 210	$ 267

Note 7 - Embedded Derivatives_2

Note 7 - Embedded Derivatives (Details Textual) $ in Thousands	1 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Apr. 19, 2017
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net, Total		$ 394	$ 2,637
Convertible 2020 Notes [Member]
Debt Instrument, Interest Rate, Stated Percentage	12.00%			12.00%
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger	150.00%
Debt Instrument, Convertible, Threshold Consecutive Trading Days	10
Number of Embedded Derivative	1
Embedded Derivative, Fair Value of Embedded Derivative, Net, Total		0
Convertible 2020 Notes [Member] | Embedded Derivative, 2020 Convertible Notes [Member]
Embedded Derivative, Fair Value of Embedded Derivative, Net, Total		0	400
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net, Total		$ 400	$ 2,600
Convertible 2017 Notes [Member]
Debt Instrument, Interest Rate, Stated Percentage	12.00%

Note 7 - Embedded Derivatives -

Note 7 - Embedded Derivatives - Schedule of Inputs to Lattice Model Used to Value Embedded Derivatives (Details)	Dec. 31, 2019	Dec. 31, 2018
Measurement Input, Exercise Price [Member]
Embedded derivative liability, measurement input	2.31	1.96
Measurement Input, Conversion Rate, Per 1000 dollars [Member]
Embedded derivative liability, measurement input	67.95	67.95
Measurement Input, Conversion Price [Member]
Embedded derivative liability, measurement input	14.72	14.72
Measurement Input, Maturity [Member]
Embedded derivative liability, measurement input	152,020	152,020
Measurement Input, Risk Free Interest Rate [Member]
Embedded derivative liability, measurement input	0.0152	0.0257
Measurement Input, Price Volatility [Member]
Embedded derivative liability, measurement input	0.6	1.5
Measurement Input, Entity Credit Risk [Member]
Embedded derivative liability, measurement input	0.27	0.31

Note 8 - Accounts Payable and_3

Note 8 - Accounts Payable and Accrued Liabilities - Components Accounts Payable and Accrued Liabilities in Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Accrued production fees	$ 1,946	$ 1,648
Accounts payable - trade	1,474	1,944
Accrued utilities and supplies	645	344
Other accrued liabilities	1,613	960
Total accounts payable and accrued liabilities	$ 5,678	$ 4,896

Note 9 - Debt (Details Textual)

Note 9 - Debt (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	Jan. 10, 2020	Apr. 19, 2017	Jan. 31, 2018	Jul. 31, 2012	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jun. 30, 2017
Long-term Debt, Total					$ 749
Convertible 2020 Notes [Member]
Debt Instrument, Interest Rate, Stated Percentage		12.00%						12.00%
Debt Instrument, Interest Rate, Paid In Kind Percentage		2.00%
Debt Instrument, Convertible, Conversion Price		$ 14.72
Debt Instrument, Convertible, Conversion Ratio		0.0679
Long-term Debt, Total					14,100
Debt Instrument, Face Amount					14,053	$ 13,775	$ 16,657
Beneficial Ownership Limitation, Percentage		4.99%
Beneficial Ownership Limitation Percentage, Notice		61 days
Beneficial Ownership Limitation After Notice, Percentage		9.99%
The 2020/21 Notes [Member] | Subsequent Event [Member]
Debt Instrument, Interest Rate, Stated Percentage	12.00%
Debt Instrument, Convertible, Conversion Price	$ 2.442
Debt Instrument, Convertible, Conversion Ratio	0.4095
Debt Instrument, Face Amount	$ 14,400
Debt Instrument, Indenture, Maturity Extension, Trigger, Percentage of Outstanding Shares	19.99%
Debt Instrument, Indenture, Maturity Extension, Trigger, Outstanding Balance	$ 7,000
Debt Instrument, PIK Interest	4.00%
Debt Instrument, Conversion Price Reduction, Discount Rate	10.00%
The 2020/21 Option Note [Member] | Subsequent Event [Member]
Maximum Principal Amount of Notes Issuable Upon Option Exercise	$ 7,100
Original Issue Discount	2.00%
Notes Payable, Other Payables [Member]
Long-term Debt, Total					749
Debt Instrument, Periodic Payment, Total					$ 10
Notes Payable, Other Payables [Member] | Minimum [Member]
Debt Instrument, Interest Rate, Stated Percentage					3.90%
Notes Payable, Other Payables [Member] | Maximum [Member]
Debt Instrument, Interest Rate, Stated Percentage					4.00%
Convertible 2022 Notes [Member]
Debt Instrument, Face Amount				$ 45,000
Debt Instrument, Interest Rate, Effective Percentage				7.50%
Proceeds from Convertible Debt				$ 40,900
Discount on Sale of Convertible Notes				2,700
Debt Issuance Costs, Gross				$ 1,400
Debt Conversion, Converted Instrument, Shares Issued			39,016
Debt Conversion, Original Debt, Amount			$ 500

Note 9 - Debt - Information Per

Note 9 - Debt - Information Pertaining to Convertible Notes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Balance
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net, Total	394	$ 2,637
Gain from change in fair value of 2020 Notes embedded derivative	394	2,637
Balance	13,900
Embedded Derivative, 2020 Convertible Notes [Member]
Balance	394	5,224
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net, Total	(394)	(2,637)
Conversion of 2020 Notes into common stock		(2,193)
Gain from change in fair value of 2020 Notes embedded derivative	(394)	(2,637)
The 2020 Notes and 2020 Notes Embedded Derivative [Member]
Balance	12,948	18,715
Amortization of debt discount	856	1,094
Amortization of debt issue costs	212	309
Paid-in-kind interest	278	304
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net, Total	(394)	(2,637)
Conversion of 2020 Notes into common stock		(4,837)
Gain from change in fair value of 2020 Notes embedded derivative	(394)	(2,637)
Balance	13,900	12,948
Convertible 2020 Notes [Member]
Balance	13,775	16,657
Balance	(979)	(2,501)
Balance	(242)	(665)
Balance	12,554	13,491
Amortization of debt discount	856	1,094
Amortization of debt issue costs	212	309
Paid-in-kind interest	278	304
Conversion of 2020 Notes into common stock		(3,186)
Conversion of 2020 Notes into common stock		428
Conversion of 2020 Notes into common stock		114
Conversion of 2020 Notes into common stock		(2,644)
Balance	14,053	13,775
Balance	(123)	(979)
Balance	(30)	(242)
Balance	$ 13,900	$ 12,554

Note 9 - Debt - Notes Payable -

Note 9 - Debt - Notes Payable - Other (Details) $ in Thousands	Dec. 31, 2019USD ($)
Notes payable, other	$ 749
Notes Payable, Other Payables [Member]
Notes payable, other	749
Less current portion	(516)
Long-term portion	233
Notes Payable, Other Payables [Member] | Notes Payable, Equipment [Member]
Notes payable, other	321
Notes Payable, Other Payables [Member] | Notes Payable, Insurance [Member]
Notes payable, other	$ 428

Note 9 - Debt - Future Payments

Note 9 - Debt - Future Payments for Notes Payable - Other (Details) $ in Thousands	Dec. 31, 2019USD ($)
2020	$ 516
2021	79
2022	60
2023	62
2024	32
	$ 749

Note 10 - Equity Incentive Pl_2

Note 10 - Equity Incentive Plans (Details Textual) - shares	1 Months Ended		12 Months Ended
	Aug. 31, 2019	Jul. 31, 2019	Dec. 31, 2019	Jul. 10, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period			4 years
Stock Incentive Plan 2010 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant			1,785,829	3,266,661
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation	79,790
Stock Incentive Plan 2010 [Member] | Share-based Payment Arrangement, Tranche One [Member] | Employees and Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		2 years
Stock Incentive Plan 2010 [Member] | August 9, 2018 [Member]
Stock Issued During Period, Shares, Restricted Stock Award, Gross		254,500
Stock Incentive Plan 2010 [Member] | June 24, 2019 [Member]
Stock Issued During Period, Shares, Restricted Stock Award, Gross		1,283,032
Stock Incentive Plan 2010 [Member] | August 8, 2019 [Member]
Stock Issued During Period, Shares, Restricted Stock Award, Gross		25,581
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant			190
Common Stock, Capital Shares Reserved for Future Issuance			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			0

Note 11 - Stock-based Compens_3

Note 11 - Stock-based Compensation (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures, Total	0	0
Share Based Compensation, Options, Estimated Forfeiture Rates Range, Lower Limit	0.00%
Share Based Compensation, Options, Estimated Forfeiture Rates Range, Upper Limit	5.00%
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	4 years
Share-based Payment Arrangement, Option [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total	$ 0
Deferred Compensation Arrangement with Individual, Maximum Contractual Term	10 years
Restricted Stock [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total	$ 1,800
Share Based Compensation Arrangement by Share Based Payment Award Fair Value of Options Vested in Period	$ 700	$ 500
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition	45 days
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	1,308,613
Restricted Stock [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	2 years
Restricted Stock [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years
Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	0	132,566
Shares Granted, Value, Share-based Payment Arrangement, after Forfeiture, Total		$ 600
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Exercise Price	$ 5.23

Note 11 - Stock-based Compens_4

Note 11 - Stock-based Compensation - Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Stock-based compensation	$ 1,349	$ 683
Stock Options Issued to Employees and Board Members [Member] | Research and Development Expense [Member]
Stock-based compensation		21
Stock Options Issued to Employees and Board Members [Member] | Selling, General and Administrative Expenses [Member]
Stock-based compensation		48
Restricted Stock [Member] | Research and Development Expense [Member]
Stock-based compensation	228	85
Restricted Stock [Member] | Selling, General and Administrative Expenses [Member]
Stock-based compensation	993	417
Stock Appreciation Rights (SARs) [Member] | Research and Development Expense [Member]
Stock-based compensation	66	61
Stock Appreciation Rights (SARs) [Member] | Selling, General and Administrative Expenses [Member]
Stock-based compensation	$ 62	$ 51

Note 11 - Stock-based Compens_5

Note 11 - Stock-based Compensation - Stock Option Award Activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Options outstanding (in shares)	2,313
Granted (in shares)	0	0
Canceled or forfeited (in shares)	(752)
Exercised (in shares)
Options outstanding (in shares)	1,561	2,313
Options exercisable (in shares)	1,511
Options vested and expected to vest (in shares)	1,561
Options outstanding, weighted average exercise price (in dollars per share)	$ 2,358.44
Granted, weighted average exercise price (in dollars per share)
Canceled or forfeited, weighted average exercise price (in dollars per share)	5,151.80
Exercised, weighted average exercise price (in dollars per share)
Options outstanding, weighted average exercise price (in dollars per share)	928.79	$ 2,358.44
Options exercisable, weighted average exercise price (in dollars per share)	1,043.47
Options vested and expected to vest, weighted average exercise price (in dollars per share)	$ 928.79
Options outstanding, weighted average remaining contractual term (Year)	6 years 204 days	6 years 317 days
Options exercisable, weighted average remaining contractual term (Year)	6 years 193 days
Options vested and expected to vest, weighted average remaining contractual term (Year)	6 years 204 days

Note 11 - Stock-based Compens_6

Note 11 - Stock-based Compensation - Non-Vested Restricted Stock (Details) - Restricted Stock [Member] - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Non-vested (in shares)	290,300
Non-vested, weighted average grant date fair value (in dollars per share)	$ 1.91	$ 3.45
Granted (in shares)	1,308,613
Granted, weighted average grant date fair value (in dollars per share)	$ 1.91
Vested (in shares)	(254,500)
Vested, weighted average grant date fair value (in dollars per share)	$ 3.45
Canceled or forfeited (in shares)	(35,800)
Canceled or forfeited, weighted average grant date fair value (in dollars per share)	$ 3.45
Non-vested (in shares)	1,308,613	290,300

Note 11 - Stock-based Compens_7

Note 11 - Stock-based Compensation - Determining Fair Value of Share-Based Payment Awards (Details) - Stock Appreciation Rights (SARs) [Member] - $ / shares	3 Months Ended		12 Months Ended
	Aug. 09, 2018	[1]	Dec. 31, 2018
Risk-free interest rate	2.84%		2.54%
Expected dividend yield
Expected volatility factor	125.03%		134.17%
Expected option life (Year)	5 years 273 days		5 years 273 days
Weighted average value (in dollars per share)	$ 4.53		$ 1.65
[1]	Stock appreciation rights were granted on May 2, 2018 and August 9, 2018. The values reported above are the weighted-average grant date value. The weighted-average strike price was $5.23 per share.

Note 12 - Income Taxes (Details

Note 12 - Income Taxes (Details Textual) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)
Income Tax Expense (Benefit), Total	$ 0
Unrecognized Tax Benefits, Ending Balance	0
Domestic Tax Authority [Member]
Operating Loss Carryforwards, Total	400,300
Domestic Tax Authority [Member] | Research Tax Credit Carryforward [Member]
Operating Loss Carryforwards, Total	3,500
State and Local Jurisdiction [Member]
Operating Loss Carryforwards, Total	$ 375,700

Note 12 - Income Taxes - Net De

Note 12 - Income Taxes - Net Deferred Tax Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Net operating loss carryforwards	$ 109,813	$ 103,612
Research and other credits	3,482	3,482
Operating lease assets	(170)
Operating lease liabilities	198
Other temporary differences	4,851	3,760
Deferred tax assets	118,175	110,854
Valuation allowance	(118,175)	(110,854)
Net deferred tax assets

Note 12 - Income Taxes - Reconc

Note 12 - Income Taxes - Reconciling Items from Income Tax Computed at the Statutory Federal Rate (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Federal income tax at statutory rate	21.00%	21.00%
State income taxes, net of federal benefits	7.00%	6.20%
Impact of change in statutory tax rates	(0.20%)	(8.80%)
Permanent deductions	(0.10%)	(3.70%)
Valuation allowance	(27.70%)	(14.70%)
Effective tax rate

Note 14 - Commitments and Con_2

Note 14 - Commitments and Contingencies (Details Textual) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Accrual for Environmental Loss Contingencies, Ending Balance	$ 0
Indemnification Agreement [Member]
Loss Contingency Accrual, Ending Balance	$ 0	$ 0

Note 15 - Fair Value Measurem_3

Note 15 - Fair Value Measurements and Fair Value of Financial Instruments (Details Textual) - Convertible 2020 Notes [Member] - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Jun. 20, 2017
Long-term Debt, Fair Value	$ 13,900	$ 12,600	$ 13,500
Embedded Derivative, Fair Value of Embedded Derivative, Net, Total	$ 0

Note 15 - Fair Value Measurem_4

Note 15 - Fair Value Measurements and Fair Value of Financial Instruments - Schedule of Carrying Value and Fair Value by Fair Value Hierarchy of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Fair Value, Recurring [Member]
Liabilities, fair value		$ 416
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Liabilities, fair value
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Liabilities, fair value
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Liabilities, fair value		416
Fair Value, Recurring [Member] | Warrant [Member]
Derivative liability, fair value	$ 8	22
Fair Value, Recurring [Member] | Warrant [Member] | Fair Value, Inputs, Level 1 [Member]
Derivative liability, fair value
Fair Value, Recurring [Member] | Warrant [Member] | Fair Value, Inputs, Level 2 [Member]
Derivative liability, fair value
Fair Value, Recurring [Member] | Warrant [Member] | Fair Value, Inputs, Level 3 [Member]
Derivative liability, fair value	8	22
Fair Value, Recurring [Member] | Embedded Derivative [Member]
Derivative liability, fair value		394
Fair Value, Recurring [Member] | Embedded Derivative [Member] | Fair Value, Inputs, Level 1 [Member]
Derivative liability, fair value
Fair Value, Recurring [Member] | Embedded Derivative [Member] | Fair Value, Inputs, Level 2 [Member]
Derivative liability, fair value
Fair Value, Recurring [Member] | Embedded Derivative [Member] | Fair Value, Inputs, Level 3 [Member]
Derivative liability, fair value		394
Fair Value, Nonrecurring [Member] | Corn and Finished Goods Inventory [Member]
Corn and finished goods inventory, fair value	940	1,047
Fair Value, Nonrecurring [Member] | Corn and Finished Goods Inventory [Member] | Fair Value, Inputs, Level 1 [Member]
Corn and finished goods inventory, fair value	267	29
Fair Value, Nonrecurring [Member] | Corn and Finished Goods Inventory [Member] | Fair Value, Inputs, Level 2 [Member]
Corn and finished goods inventory, fair value	673	1,018
Fair Value, Nonrecurring [Member] | Corn and Finished Goods Inventory [Member] | Fair Value, Inputs, Level 3 [Member]
Corn and finished goods inventory, fair value

Note 15 - Fair Value Measurem_5

Note 15 - Fair Value Measurements and Fair Value of Financial Instruments - Schedule of Fair Value Measurements Using Level 3 Inputs (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)
Derivative Financial Instruments, Liabilities [Member]
Balance, December 31, 2018	$ 22
Total (gains) or losses for the period included in earnings	(14)
Purchases
Balance, December 31, 2019	8
Embedded Derivative, 2020 Convertible Notes [Member]
Balance, December 31, 2018	394
Total (gains) or losses for the period included in earnings	(394)
Purchases
Balance, December 31, 2019

Note 16 - Segments (Details Tex

Note 16 - Segments (Details Textual) $ in Millions	12 Months Ended
	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)
Number of Operating Segments	2
Intercompany Sales	$ 0.4	$ 0.1

Note 16 - Segments - Informatio

Note 16 - Segments - Information on Business Segments (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018
Total revenues		$ 24,487	$ 32,863
Loss from operations		(26,351)	(22,201)
Interest expense		2,732	3,237
Depreciation and amortization		6,656	6,520
Acquisitions of plant, property and equipment		6,497	3,123
Assets	[1]	93,359	107,035
UNITED STATES
Total revenues		22,149	31,641
Non-US [Member]
Total revenues		2,338	1,222
Intersegment Eliminations [Member]
Assets	[2]	(141,851)	(139,326)
Gevo [Member]
Total revenues		2,338	1,222
Loss from operations		(12,360)	(11,552)
Interest expense		2,732	3,237
Depreciation and amortization		210	269
Acquisitions of plant, property and equipment		130	27
Gevo [Member] | Operating Segments [Member]
Assets		91,861	105,379
Gevo Development / Agri-Energy [Member]
Total revenues		22,149	31,641
Loss from operations		(13,991)	(10,649)
Interest expense
Depreciation and amortization		6,446	6,251
Acquisitions of plant, property and equipment		6,367	3,096
Gevo Development / Agri-Energy [Member] | Operating Segments [Member]
Assets		$ 143,349	$ 140,982
[1]	All other significant non-cash items relate to the activities of Gevo.
[2]	Includes intercompany sales of $0.4 million and $0.1 million during the years ended December 31, 2019 and 2018, respectively, for hydrocarbon sales.