Gevo (GEVO) 10-Q 10 May 18 2018 Q1 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	3 Months Ended
	Mar. 31, 2018	Apr. 30, 2018
Document Information [Line Items]
Entity Registrant Name	Gevo, Inc.
Entity Central Index Key	1,392,380
Trading Symbol	gevo
Current Fiscal Year End Date	--12-31
Entity Filer Category	Smaller Reporting Company
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	No
Entity Common Stock, Shares Outstanding (in shares)		24,194,353
Document Type	10-Q
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q1
Amendment Flag	false

Consolidated Balance Sheets (Cu

Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 7,029	$ 11,553
Accounts receivable	1,288	1,054
Inventories	4,356	4,362
Prepaid expenses and other current assets	633	712
Total current assets	13,306	17,681
Property, plant and equipment, net	68,764	70,369
Deposits and other assets	803	803
Total assets	82,873	88,853
Current liabilities:
Accounts payable and accrued liabilities	3,467	4,011
2020 Notes embedded derivative liability	2,366	5,224
Derivative warrant liability	1,474	1,951
Total current liabilities	7,307	11,186
Other long-term liabilities	117	130
Total liabilities	21,317	25,322
Commitments and Contingencies (see Note 11)
Stockholders' Equity
Common Stock, $0.01 par value per share; 250,000,000 authorized, 22,696,112 and 21,811,059 shares issued and outstanding at March 31, 2018 and December 31, 2017, respectively.	227	218
Additional paid-in capital	465,181	464,663
Accumulated deficit	(403,852)	(401,350)
Total stockholders' equity	61,556	63,531
Total liabilities and stockholders' equity	82,873	88,853
Convertible 2020 Notes [Member]
Current liabilities:
2020 Notes, net	13,893	13,491
Convertible 2022 Notes [Member]
Current liabilities:
2020 Notes, net		$ 515

Consolidated Balance Sheets (C3

Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares	Mar. 31, 2018	Dec. 31, 2017
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)	22,696,112	21,811,059
Common stock, shares outstanding (in shares)	22,696,112	21,811,059

Consolidated Statements of Oper

Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenue	$ 8,243	$ 5,584
Grant and other revenue	25	32
Total revenues	8,243	5,616
Cost of goods sold	10,583	9,408
Gross loss	(2,340)	(3,792)
Operating expenses
Research and development expense	789	1,217
Selling, general and administrative expense	1,870	2,173
Total operating expenses	2,659	3,390
Loss from operations	(4,999)	(7,182)
Other (expense) income
Interest expense	(825)	(714)
(Loss) on exchange of debt	(21)	(964)
(Loss) from change in fair value of the 2017 Notes		(339)
Gain from change in fair value of derivative warrant liability	477	3,259
Gain from change in fair value of 2020 Notes embedded derivative	2,858
Other income	8	6
Total other expense, net	2,497	1,248
Net loss	$ (2,502)	$ (5,934)
Net loss per share - basic and diluted (in dollars per share)	$ (0.11)	$ (0.51)
Weighted-average number of common shares outstanding - basic and diluted (in shares)	22,534,727	11,584,595
Ethanol Sales and Related Products [Member]
Revenue	$ 8,218	$ 5,494
Total revenues	8,218	5,494
Hydrocarbon [Member]
Revenue		90
Total revenues		$ 90

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Operating Activities
Net loss	$ (2,502)	$ (5,934)
Adjustments to reconcile net loss to net cash used in operating activities:
(Gain) from change in fair value of derivative warrant liability	(477)	(3,226)
(Gain) from change in fair value of 2020 Notes embedded derivative	(2,858)
Loss from the change in fair value of the 2017 Notes		339
Loss on exchange of debt	21	964
(Gain) on extinguishment of warrant liability		(33)
Stock-based compensation	98	128
Depreciation and amortization	1,646	1,676
Non-cash interest expense	402	80
Changes in operating assets and liabilities:
Accounts receivable	(234)	(82)
Inventories	7	(720)
Prepaid expenses and other current assets	78	(11)
Accounts payable, accrued expenses, and long-term liabilities	(531)	(1,228)
Net cash used in operating activities	(4,350)	(8,047)
Investing Activities
Acquisitions of property, plant and equipment	(67)	(673)
Net cash used in investing activities	(67)	(673)
Financing Activities
Payments on secured debt		(9,616)
Debt and equity offering costs	(164)	(205)
Proceeds from issuance of common stock and common stock warrants	57	11,044
Proceeds from the exercise of warrants		2
Net cash (used in)/provided by financing activities	(107)	1,225
Net (decrease) in cash and cash equivalents	(4,524)	(7,495)
Beginning of period	11,553	30,499
End of period	7,029	23,004
Cash paid for interest, net of interest capitalized	434	1,616
Non-cash purchase of property, plant and equipment	1	461
Exchange of convertible debt into common stock	515	8,177
Accrued offering costs		73
Fair value of warrants at issuance and upon exercise, net		$ 5,503

Note 1 - Nature of Business, Fi

Note 1 - Nature of Business, Financial Condition, Basis of Presentation and Reverse Stock Split	3 Months Ended
	Mar. 31, 2018
Notes to Financial Statements
Business Description and Basis of Presentation [Text Block]	1. Nature of Business June 9, 2005. September 2009 8. September 2010. September 2010. The Company developed proprietary technology that uses a combination of synthetic biology, metabolic engineering, chemistry and chemical engineering to make isobutanol and hydrocarbon products from isobutanol that can displace petrochemical incumbent products. The Company has been able to genetically engineer yeast, whereby the yeast produces isobutanol from carbohydrates. Through May 2012, 2011 May 2012. September 2012, In 2013, one million In 2014, one three may two may one The Company’s technology converts its renewable isobutanol to alcohol-to-jet (“ATJ”), isooctane, isooctene, and para-xylene (building block for polyester) at its hydrocarbons demonstration plant located at South Hampton Resources located in Silsbee, Texas. In addition the Company’s Luverne Facility has production capacity of about 20 45 50 3 As of March 31, 2018, Financial Condition three March 31, 2018 2017, $2.5 $5.9 $403.9 March 31, 2018. March 31, 2018 $7.0 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 not one 2017 may not At-the-Market Offering Program. February 2018, $5.0 first 2018, 104,138 $0.1 $1,000 $0.2 one At-the-Market Offering Program" $4.9 Basis of Presentation. not March 31, 2018 not 8 10 December 31, 2017 NASDAQ Market Price Compliance. June 21, 2017, 30 not $1.00 180 December 20, 2017, 180 June 18, 2018, $1.00 10 June 18, 2018. second second Recent Accounting Pronouncements Leases (“ASU 2016 02” February 2016, No. 2016 02, Topic 842 2016 02 2016 02 December 15, 2018, March 31, 2018 $2.7 2016 02 Derivatives and Hedging (Topic 815 2017 11” July 2017, No. 2017 11, Derivatives and Hedging (Topic 815 not Adoption of New Accounting Pronouncements . Revenue from Contracts with Customers (“ASU 2014 09” May 2014, No. 2014 09, Revenue from Contracts with Customers 2014 09 five 2014 09 December 15, 2016. July 9, 2015, 2014 09 one December 15, 2017. April 2016, Accounting Standards Update No. 2016 10 2016 10” Identifying Performance Obligations and Licensing no no 2014 09 January 1, 2018. 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 primarily has historically consisted of revenues from governmental and cooperative research grants. The following provides the Company’s assessment on how this standard impacted the Company upon its adoption effective January 1, 2018 Ethanol sales and related products revenues. no 100 74% 80% three March 31, 2018 2017, not no January 1, 2018. Hydrocarbon revenue. no no January 1, 2018. Grant and other revenues. Northwest Advanced Renewables Alliance 2014. not 606 Revenues from Contracts with Customers” 2014 09. 606 no January 1, 2018. Statement of Cash Flows – Restricted Cash (“ASU 2016 18” November 2016, No. 2016 18, Statement of Cash Flows – Restricted Cash December 15, 2017, January 1, 2018 2017 nine twelve December 31, 2017, $2.6 April 2017. The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported within the statement of financial position that sum to the total of the same such amounts shown in the statement of cash flows (all amounts unaudited and in thousands): March 31, 2018 2017 Cash and cash equivalents $ 7,029 $ 20,393 Restricted cash - 2,611 Total cash, cash equivalents, and restricted cash shown in the statement of cash flows. $ 7,029 $ 23,004

Note 2 - Earnings Per Share

Note 2 - Earnings Per Share	3 Months Ended
	Mar. 31, 2018
Notes to Financial Statements
Earnings Per Share [Text Block]	2. Basic net loss per share 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 March 31, 2018 2017 The following table sets forth securities outstanding that could potentially dilute the calculation of diluted earnings per share. March 31, 2018 2017 Warrants to purchase common stock - liability classified (see Note 6) 7,192,373 14,017,373 Warrant to purchase common stock - equity classified 1,393 1,393 2017 Notes – 47,827 2020 Notes 28,093,500 – 2022 Notes – 688 Outstanding options to purchase common stock 46,431 76,915 Unvested restricted common stock 2,204 7,536 Total 35,335,901 14,151,732 The Company issued 1,498,241 April 1, 2018 May 10, 2018, not

Note 3 - Revenues From Contract

Note 3 - Revenues From Contracts With Customers Other Revenues	3 Months Ended
	Mar. 31, 2018
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 primarily has historically consisted of revenues from governmental and cooperative research grants. Ethanol sales and related products revenues. no Hydrocarbon revenue. no Grant and other revenues. Northwest Advanced Renewables Alliance 2014. not 606 Revenues from Contracts with Customers” one December 2017, 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 Three Months Ended March 31, 2018 Major Goods/Service Line Revenues from Contracts with Customers Other Revenues Total Ethanol sales and related products, net $ 8,218 $ 8,218 Hydrocarbon revenue - - - Grant and other revenue 25 - 25 $ 8,243 $ - $ 8,243 Timing of Revenue Recognition Goods transferred at a point in time $ 8,218 $ - $ 8,218 Services transferred over time 25 - 25 $ 8,243 $ - $ 8,243 Operating Segment Gevo $ 25 $ - $ 25 Gevo Development / Agri-Energy 8,218 - 8,218 $ 8,243 $ - $ 8,243 Geographic Region United States $ 8,243 $ - $ 8,243 Other - - $ 8,243 $ - $ 8,243 Three Months Ended March 31, 2017 Major Goods/Service Line Revenues from Contracts with Customers Other Revenues Total Ethanol sales and related products, net $ 5,494 $ - $ 5,494 Hydrocarbon revenue 90 - 90 Grant and other revenue – 32 32 $ 5,584 $ 32 $ 5,616 Timing of Revenue Recognition Goods transferred at a point in time $ 5,584 $ - $ 5,584 Services transferred over time - 32 32 $ 5,584 $ 32 $ 5,616 Operating Segment Gevo $ 90 $ - $ 90 Gevo Development / Agri-Energy 5,494 32 5,526 $ 5,584 $ 32 $ 5,616 Geographic Region United States $ 5,494 $ 32 $ 5,526 Other 90 - 90 $ 5,584 $ 32 $ 5,616 Goods transferred at a point-in-time. three March 31, 2018 2017, no March 31, 2018 December 31, 2017, 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 For the three March 31, 2018 2017, no March 31, 2018 December 31, 2017, no For the three March 31, 2018 2017, Contract Assets and Trade Receivables As of March 31, 2018 December 31, 2017, no not no not March 31, 2018 December 31, 2017.

Note 4 - Inventories

Note 4 - Inventories	3 Months Ended
	Mar. 31, 2018
Notes to Financial Statements
Inventory Disclosure [Text Block]	4. The following table sets forth the components of the Company’s inventory balances (in thousands). March 31, December 31, 2018 2017 Raw materials Corn $ 33 $ 189 Enzymes and other inputs 172 202 Nutrients 5 5 Finished goods Ethanol 385 222 Isobutanol 1,010 1,122 Jet Fuels, Isooctane and Isooctene 908 524 Distiller's grains 23 59 Work in process - Agri-Energy 226 197 Work in process - Gevo 145 437 Spare parts 1,449 1,405 Total inventories $ 4,356 $ 4,362 Work in process inventory includes unfinished jet fuel, isooctane, and isooctene inventory.

Note 5 - Property, Plant and Eq

Note 5 - Property, Plant and Equipment	3 Months Ended
	Mar. 31, 2018
Notes to Financial Statements
Property, Plant and Equipment Disclosure [Text Block]	5. The following table sets forth the Company’s property, plant and equipment by classification (in thousands). Useful Life March 31, December 31, (in years) 2018 2017 Construction in progress $ 507 $ 479 Plant machinery and equipment 10 16,285 16,284 Site improvements 10 7,051 7,051 Luverne retrofit asset 20 70,842 70,842 Lab equipment, furniture and fixtures and vehicles 5 6,513 6,513 Demonstration plant 2 3,597 3,597 Buildings 10 2,543 2,543 Computer, office equipment and software 3 1,807 1,795 Leasehold improvements, pilot plant, land and support equipment 2 - 5 2,536 2,536 Total property, plant and equipment 111,681 111,640 Less accumulated depreciation and amortization (42,917 ) (41,271 ) Property, plant and equipment, net $ 68,764 $ 70,369 Included in cost of goods sold is depreciation of $1.6 $1.5 three March 31, 2018 2017, Included in operating expenses is depreciation of $0.1 $0.1 three March 31, 2018 2017,

Note 6 - Embedded Derivatives a

Note 6 - Embedded Derivatives and Derivative Warrant Liabilities	3 Months Ended
	Mar. 31, 2018
Notes to Financial Statements
Discussion of Hybrid Instruments and Embedded Derivatives [Text Block]	6. 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 2020 2020 2020 2020 2020 2020 As of March 31, 2018, $2.4 $2.9 three March 31, 2018, 2020 The following table sets forth the inputs to the lattice model that were used to value the embedded derivatives. March 31, December 31, 2018 2017 Stock price $ 0.46 0.59 Conversion Rate per $1,000 1,358.90 1,358.90 Conversion Price $ 0.74 $ 0.74 Maturity date March 15, 2020 March 15, 2020 Risk-free interest rate 2.24 % 1.89 % Estimated stock volatility 75 % 75 % Estimated credit spread 28 % 28 % 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 2022 In July 2012, 7.5% July 2022 ( “2022 2022 “2022 2022 2022 July 1, 2017. The Company had concluded that the embedded derivatives within the 2020 December 31, 2017, 2020 January 2018, 2022 $0.5 2022 780,303 2022 no 2022 2022 Derivative Warrant Liability The following warrants were sold by the Company: • In December 2013, 71,013 “2013 • In August 2014, 50,000 “2014 • In February 2015, 110,833 110,883 • In May 2015, 21,500 • In December 2015, 502,500 400,000 • In April 2016, 514,644 1,029,286 328,571 • In September 2016, 712,503 185,000 • In February 2017, 6,250,000 6,250,000 570,000 The following table sets forth information pertaining to shares issued upon the exercise of such warrants as of March 31, 2018: Issuance Date Expiration Date Exercise Price as of March 31, 2018 Shares Underlying Warrants on Issuance Date Shares Issued upon Warrant Exercises as of March 31, 2018 Shares Underlying Warrants Outstanding as of March 31, 2018 2013 Warrants 12/16/2013 12/16/2018 $ 8.99 71,013 15,239 55,774 2014 Warrants 08/05/2014 08/05/2019 $ 6.83 50,000 30,538 19,462 Series A Warrants 02/03/2015 02/03/2020 $ 0.68 110,833 99,416 11,417 Series B Warrants 02/03/2015 08/03/2015 - (1) 110,833 110,833 - Series C Warrants 05/19/2015 05/19/2020 $ 5.50 21,500 - 21,500 Series D Warrants 12/11/2015 12/11/2020 $ 2.00 502,500 501,570 930 Series E Warrants 12/11/2015 12/11/2020 - (1) 400,000 400,000 - Series F Warrants 04/01/2016 04/01/2021 $ 2.00 514,644 233,857 280,787 Series G Warrants 04/01/2016 04/01/2017 - (1) 328,571 328,571 - Series H Warrants 04/01/2016 10/01/2016 - (1) 1,029,286 1,029,286 - Series I Warrants 09/13/2016 09/13/2021 $ 11.00 712,503 - 712,503 Series J Warrants 09/13/2016 09/13/2017 - (1) 185,000 185,000 - Series K Warrants 02/17/2017 2/17/2022 $ 0.60 6,250,000 160,000 6,090,000 Series L Warrants 02/17/2017 02/17/2018 - (1) 570,000 570,000 - Series M-A Warrants 02/17/2017 11/17/2017 - (1), (2) 2,305,000 1,485,000 - Series M-B Warrants 02/17/2017 11/17/2017 - (1), (3) 3,945,000 3,945,000 - 17,106,683 9,094,310 7,192,373 ( 1 Warrants have either been fully exercised and/or expired as of March 31, 2018. ( 2 In October 2017, 1,485,000 $0.60 $0.65 fourth 2017, $1.0 ( 3 In September 2017, 3,945,000 $0.60. second 2017, $2.4 ( 4 This table does not 1,393 2008 2012, $17.70 $24.45 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 not may • 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 30 may There were no three March 31, 2018. As of March 31, 2018,

Note 7 - Accounts Payable and A

Note 7 - Accounts Payable and Accrued Liabilities	3 Months Ended
	Mar. 31, 2018
Notes to Financial Statements
Accounts Payable and Accrued Liabilities Disclosure [Text Block]	7. 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, 2018 2017 Accounts payable - trade $ 772 $ 666 Accrued legal-related fees 192 274 Accrued employee compensation 470 700 Accrued interest 416 434 Accrued production fees 353 447 Accrued utilities and supplies payable 833 677 Accrued taxes payable 358 172 Customer deposit - 436 Other accrued liabilities * 73 205 Total accounts payable and accrued liabilities $ 3,467 $ 4,011 * Other accrued liabilities consist of franchise taxes, audit fees, and a variety of other expenses, none five

Note 8 - Debt

Note 8 - Debt	3 Months Ended
	Mar. 31, 2018
Notes to Financial Statements
Debt Disclosure [Text Block]	8. 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 - 252 - 252 - 252 Amortization of debt issue costs - - 67 67 - 67 Paid-in-kind interest 83 - - 83 - 83 Change in fair value of 2020 Notes embedded derivative - - - - (2,858 ) (2,858 ) Balance - March 31, 2018 $ 16,740 $ (2,249 ) $ (598 ) $ 13,893 $ 2,366 $ 16,259 On April 19, 2017, 2017 2020 June 6, 2014, “2017 June 15, 2017), 2017 2020 2017 $5.0 2020 2020 ninety 90 third 2017. June 20, 2017, 2017 2017 $4.0 The 2020 March 15, 2020. 2020 12% 2% March 31, June 30, September 30, December 31 2020 2020 2020 2020 2020 may 2020 2020 The 2020 2020 $0.7359 1.3589 $1 2020 one first ninety 90 25% ninety 90 one hundred eighty 180 35% one hundred eighty 180 Each Holder has agreed not 2020 4.99% “4.99% may, sixty-one 61 9.99% “9.99% 2020 4.99% 9.99% nine 6 Other than as set forth in the Reset Provision, the 2020 not Under certain circumstances, we may one 3 2020 2022 The following table sets forth information pertaining to the 2022 Principal Amount of 2022 Notes Balance - December 31, 2017 $ 515 Exchange of 2022 Notes (515 ) Balance – March 31, 2018 $ — In July 2012, $45.0 2022 $40.9 $2.7 $1.4 2022 7.5% January 1 July 1 2022 July 1, 2022, three March 31, 2018 2017, ● $0.0 $0.08 ● $0.02 $1.2 ● $0.0 $0.02 2022 The amortization of debt issue costs, debt discounts and cash interest are included as a component of interest expense in the consolidated statements of operations. The Company amortized debt discounts and debt issue costs associated with the 2022 40% July 1, 2017, five 2022 In January 2018, 2022 $0.5 2022 780,303 2022 no 2022

Note 9 - Gevo Development

Note 9 - Gevo Development	3 Months Ended
	Mar. 31, 2018
Notes to Financial Statements
Investments in and Advances to Affiliates, Schedule of Investments [Text Block]	9. The Company made capital contributions to Gevo Development of $1.3 $8.9 three March 31, 2018 December 31, 2017. The following table sets forth (in thousands) the net loss incurred by Gevo Development (including Agri-Energy after September 22, 2010, September 2010 100% September 22, 2010 Three Months Ended March 31, 2018 2017 Gevo Development Net Loss $ (2,517 ) $ (4,173 ) The accounts of Agri-Energy are consolidated within Gevo Development as a wholly-owned subsidiary which is then consolidated into Gevo.

Note 10 - Stock-based Compensat

Note 10 - Stock-based Compensation	3 Months Ended
	Mar. 31, 2018
Notes to Financial Statements
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]	10. 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, 2018 2017 Stock options and employee stock purchase plan awards Research and development $ 9 $ 9 Selling, general and administrative 30 30 Restricted stock awards Research and development — 12 Selling, general and administrative — 17 Restricted stock units Research and development 17 18 Selling, general and administrative 41 42 Total stock-based compensation $ 97 $ 128

Note 11 - Commitments and Conti

Note 11 - Commitments and Contingencies	3 Months Ended
	Mar. 31, 2018
Notes to Financial Statements
Commitments and Contingencies Disclosure [Text Block]	11. Legal Matters may not not Leases December 31, 2012, six March 31, 2018 December 31, 2017, no The Company has an operating lease for its office, research, and production facility in Englewood, Colorado with a term expiring in July 2021. 12 Rent expense for the three March 31, 2018 2017 $0.4 $0.4 The table below shows the future minimum payments under non-cancelable operating leases and at March 31, 2018 ( Operating Leases 2018 (remaining) $ 1,094 2019 943 2020 430 2021 218 2022 and thereafter – Total $ 2,685 The Company entered into a five April 2, 2018 $0.6 Indemnifications may March 31, 2018 December 31, 2017, not Certain of the Company’s financial instruments consist of cash and cash equivalents, accounts receivable, and accounts payable, for which the carrying value on the Company’s balance sheet approximates their fair values due to the short maturities. 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, 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 March 31, 2018 December 31, 2017.

Note 12 - Fair Value Measuremen

Note 12 - Fair Value Measurements	3 Months Ended
	Mar. 31, 2018
Notes to Financial Statements
Fair Value Disclosures [Text Block]	12. 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 our financial instruments, excluding cash and cash equivalents, accounts receivable and accounts payable at March 31, 2018 December 31, 2017, Fair Value Measurements at March 31, 2018 (In thousands) Fair Value at March 31, 2018 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 $ 1,474 $ - $ - $ 1,474 2020 Embedded Derivative Liability 2,366 - - 2,366 Total Recurring Fair Value Measurements $ 3,840 $ - $ - $ 3,840 Nonrecurring Corn and finished goods inventory $ 1,835 $ 33 $ 1,802 $ - Total Non-Recurring Fair Value Measurements $ 1,835 $ 33 $ 1,802 $ - Fair Value Measurements at December 31, 2017 (In thousands) Fair Value at December 31, 2017 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 $ 1,951 $ – $ – $ 1,951 2020 Notes Embedded Derivative Liability 5,224 – – 5,224 Total Recurring Fair Value Measurements $ 7,175 $ – $ – $ 7,175 Nonrecurring Corn and finished goods inventory $ 1,916 $ 189 $ 1,727 $ – Total Non-Recurring Fair Value Measurements $ 1,916 $ 189 $ 1,727 $ – The following table provides changes to those fair value measurements using Level 3 three March 31, 2018. Fair Value Measurements Using Significant Unobservable Inputs (Level 3) (in thousands) Derivative Warrant Liability 2020 Notes Embedded Derivative Opening Balance $ 1,951 $ 5,224 Transfers into Level 3 – – Transfers out of Level 3 – – Total (gains) or losses for the period Included in earnings (477 ) (2,858 ) Included in other comprehensive income – – Purchases, issues, sales and settlements Purchases – – Issues – – Sales – – Settlements – – Closing balance $ 1,474 $ 2,366 Inventories. 1 2 2020 $2.4 March 31, 2018 $5.2 December 31, 2017 3 Change in fair value of 2020 6, Derivative Warrant Liability 2017, 3 2 first 2017, 3 3 first 2018, $1.5 March 31, 2018. Change in fair value of derivative warrant liability 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 13 - Segments

Note 13 - Segments	3 Months Ended
	Mar. 31, 2018
Notes to Financial Statements
Segment Reporting Disclosure [Text Block]	13. We have determined that we have two Gevo Segment Gevo Development/Agri-Energy Segment Three Months Ended March 31, 2018 2017 Revenues: Gevo $ 25 $ 90 Gevo Development / Agri-Energy 8,218 5,526 Consolidated $ 8,243 $ 5,616 Loss from operations: Gevo $ (2,476 ) $ (3,065 ) Gevo Development / Agri-Energy (2,523 ) (4,117 ) Consolidated $ (4,999 ) $ (7,182 ) Interest expense: Gevo $ 825 $ 714 Gevo Development / Agri-Energy – – Consolidated $ 825 $ 714 Depreciation expense: Gevo $ 84 $ 137 Gevo Development / Agri-Energy 1,562 1,539 Consolidated $ 1,646 $ 1,676 Acquisitions of plant, property and equipment: Gevo $ – $ 56 Gevo Development / Agri-Energy 67 617 Consolidated $ 67 $ 673 March 31, December 31, 2018 2017 Total assets: Gevo $ 81,629 $ 87,507 Gevo Development / Agri-Energy 147,290 149,758 Intercompany eliminations (146,046 ) (148,412 ) Consolidated $ 82,873 $ 88,853

Note 14 - Subsequent Events

Note 14 - Subsequent Events	3 Months Ended
	Mar. 31, 2018
Notes to Financial Statements
Subsequent Events [Text Block]	14. None 2 11 March 31, 2018.

Significant Accounting Policies

Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2018
Accounting Policies [Abstract]
Nature of Business [Policy Text Block]	Nature of Business June 9, 2005. September 2009 8. September 2010. September 2010. The Company developed proprietary technology that uses a combination of synthetic biology, metabolic engineering, chemistry and chemical engineering to make isobutanol and hydrocarbon products from isobutanol that can displace petrochemical incumbent products. The Company has been able to genetically engineer yeast, whereby the yeast produces isobutanol from carbohydrates. Through May 2012, 2011 May 2012. September 2012, In 2013, one million In 2014, one three may two may one The Company’s technology converts its renewable isobutanol to alcohol-to-jet (“ATJ”), isooctane, isooctene, and para-xylene (building block for polyester) at its hydrocarbons demonstration plant located at South Hampton Resources located in Silsbee, Texas. In addition the Company’s Luverne Facility has production capacity of about 20 45 50 3 As of March 31, 2018,
Financial Condition [Policy Text Block]	Financial Condition three March 31, 2018 2017, $2.5 $5.9 $403.9 March 31, 2018. March 31, 2018 $7.0 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 not one 2017 may not
Basis of Accounting, Policy [Policy Text Block]	Basis of Presentation. not March 31, 2018 not 8 10 December 31, 2017 NASDAQ Market Price Compliance. June 21, 2017, 30 not $1.00 180 December 20, 2017, 180 June 18, 2018, $1.00 10 June 18, 2018. second second
New Accounting Pronouncements, Policy [Policy Text Block]	Recent Accounting Pronouncements Leases (“ASU 2016 02” February 2016, No. 2016 02, Topic 842 2016 02 2016 02 December 15, 2018, March 31, 2018 $2.7 2016 02 Derivatives and Hedging (Topic 815 2017 11” July 2017, No. 2017 11, Derivatives and Hedging (Topic 815 not Adoption of New Accounting Pronouncements . Revenue from Contracts with Customers (“ASU 2014 09” May 2014, No. 2014 09, Revenue from Contracts with Customers 2014 09 five 2014 09 December 15, 2016. July 9, 2015, 2014 09 one December 15, 2017. April 2016, Accounting Standards Update No. 2016 10 2016 10” Identifying Performance Obligations and Licensing no no 2014 09 January 1, 2018. 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 primarily has historically consisted of revenues from governmental and cooperative research grants. The following provides the Company’s assessment on how this standard impacted the Company upon its adoption effective January 1, 2018 Ethanol sales and related products revenues. no 100 74% 80% three March 31, 2018 2017, not no January 1, 2018. Hydrocarbon revenue. no no January 1, 2018. Grant and other revenues. Northwest Advanced Renewables Alliance 2014. not 606 Revenues from Contracts with Customers” 2014 09. 606 no January 1, 2018. Statement of Cash Flows – Restricted Cash (“ASU 2016 18” November 2016, No. 2016 18, Statement of Cash Flows – Restricted Cash December 15, 2017, January 1, 2018 2017 nine twelve December 31, 2017, $2.6 April 2017. The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported within the statement of financial position that sum to the total of the same such amounts shown in the statement of cash flows (all amounts unaudited and in thousands): March 31, 2018 2017 Cash and cash equivalents $ 7,029 $ 20,393 Restricted cash - 2,611 Total cash, cash equivalents, and restricted cash shown in the statement of cash flows. $ 7,029 $ 23,004

Note 1 - Nature of Business, 21

Note 1 - Nature of Business, Financial Condition, Basis of Presentation and Reverse Stock Split (Tables)	3 Months Ended
	Mar. 31, 2018
Notes Tables
Schedule of Cash and Cash Equivalents [Table Text Block]	March 31, 2018 2017 Cash and cash equivalents $ 7,029 $ 20,393 Restricted cash - 2,611 Total cash, cash equivalents, and restricted cash shown in the statement of cash flows. $ 7,029 $ 23,004

Note 2 - Earnings Per Share (Ta

Note 2 - Earnings Per Share (Tables)	3 Months Ended
	Mar. 31, 2018
Notes Tables
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]	March 31, 2018 2017 Warrants to purchase common stock - liability classified (see Note 6) 7,192,373 14,017,373 Warrant to purchase common stock - equity classified 1,393 1,393 2017 Notes – 47,827 2020 Notes 28,093,500 – 2022 Notes – 688 Outstanding options to purchase common stock 46,431 76,915 Unvested restricted common stock 2,204 7,536 Total 35,335,901 14,151,732

Note 3 - Revenues From Contra23

Note 3 - Revenues From Contracts With Customers Other Revenues (Tables)	3 Months Ended
	Mar. 31, 2018
Notes Tables
Disaggregation of Revenue [Table Text Block]	Three Months Ended March 31, 2018 Major Goods/Service Line Revenues from Contracts with Customers Other Revenues Total Ethanol sales and related products, net $ 8,218 $ 8,218 Hydrocarbon revenue - - - Grant and other revenue 25 - 25 $ 8,243 $ - $ 8,243 Timing of Revenue Recognition Goods transferred at a point in time $ 8,218 $ - $ 8,218 Services transferred over time 25 - 25 $ 8,243 $ - $ 8,243 Operating Segment Gevo $ 25 $ - $ 25 Gevo Development / Agri-Energy 8,218 - 8,218 $ 8,243 $ - $ 8,243 Geographic Region United States $ 8,243 $ - $ 8,243 Other - - $ 8,243 $ - $ 8,243 Three Months Ended March 31, 2017 Major Goods/Service Line Revenues from Contracts with Customers Other Revenues Total Ethanol sales and related products, net $ 5,494 $ - $ 5,494 Hydrocarbon revenue 90 - 90 Grant and other revenue – 32 32 $ 5,584 $ 32 $ 5,616 Timing of Revenue Recognition Goods transferred at a point in time $ 5,584 $ - $ 5,584 Services transferred over time - 32 32 $ 5,584 $ 32 $ 5,616 Operating Segment Gevo $ 90 $ - $ 90 Gevo Development / Agri-Energy 5,494 32 5,526 $ 5,584 $ 32 $ 5,616 Geographic Region United States $ 5,494 $ 32 $ 5,526 Other 90 - 90 $ 5,584 $ 32 $ 5,616

Note 4 - Inventories (Tables)

Note 4 - Inventories (Tables)	3 Months Ended
	Mar. 31, 2018
Notes Tables
Schedule of Inventory, Current [Table Text Block]	March 31, December 31, 2018 2017 Raw materials Corn $ 33 $ 189 Enzymes and other inputs 172 202 Nutrients 5 5 Finished goods Ethanol 385 222 Isobutanol 1,010 1,122 Jet Fuels, Isooctane and Isooctene 908 524 Distiller's grains 23 59 Work in process - Agri-Energy 226 197 Work in process - Gevo 145 437 Spare parts 1,449 1,405 Total inventories $ 4,356 $ 4,362

Note 5 - Property, Plant and 25

Note 5 - Property, Plant and Equipment (Tables)	3 Months Ended
	Mar. 31, 2018
Notes Tables
Property, Plant and Equipment [Table Text Block]	Useful Life March 31, December 31, (in years) 2018 2017 Construction in progress $ 507 $ 479 Plant machinery and equipment 10 16,285 16,284 Site improvements 10 7,051 7,051 Luverne retrofit asset 20 70,842 70,842 Lab equipment, furniture and fixtures and vehicles 5 6,513 6,513 Demonstration plant 2 3,597 3,597 Buildings 10 2,543 2,543 Computer, office equipment and software 3 1,807 1,795 Leasehold improvements, pilot plant, land and support equipment 2 - 5 2,536 2,536 Total property, plant and equipment 111,681 111,640 Less accumulated depreciation and amortization (42,917 ) (41,271 ) Property, plant and equipment, net $ 68,764 $ 70,369

Note 6 - Embedded Derivatives26

Note 6 - Embedded Derivatives and Derivative Warrant Liabilities (Tables)	3 Months Ended
	Mar. 31, 2018
Notes Tables
Schedule of Assumptions Used [Table Text Block]	March 31, December 31, 2018 2017 Stock price $ 0.46 0.59 Conversion Rate per $1,000 1,358.90 1,358.90 Conversion Price $ 0.74 $ 0.74 Maturity date March 15, 2020 March 15, 2020 Risk-free interest rate 2.24 % 1.89 % Estimated stock volatility 75 % 75 % Estimated credit spread 28 % 28 %
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]	Issuance Date Expiration Date Exercise Price as of March 31, 2018 Shares Underlying Warrants on Issuance Date Shares Issued upon Warrant Exercises as of March 31, 2018 Shares Underlying Warrants Outstanding as of March 31, 2018 2013 Warrants 12/16/2013 12/16/2018 $ 8.99 71,013 15,239 55,774 2014 Warrants 08/05/2014 08/05/2019 $ 6.83 50,000 30,538 19,462 Series A Warrants 02/03/2015 02/03/2020 $ 0.68 110,833 99,416 11,417 Series B Warrants 02/03/2015 08/03/2015 - (1) 110,833 110,833 - Series C Warrants 05/19/2015 05/19/2020 $ 5.50 21,500 - 21,500 Series D Warrants 12/11/2015 12/11/2020 $ 2.00 502,500 501,570 930 Series E Warrants 12/11/2015 12/11/2020 - (1) 400,000 400,000 - Series F Warrants 04/01/2016 04/01/2021 $ 2.00 514,644 233,857 280,787 Series G Warrants 04/01/2016 04/01/2017 - (1) 328,571 328,571 - Series H Warrants 04/01/2016 10/01/2016 - (1) 1,029,286 1,029,286 - Series I Warrants 09/13/2016 09/13/2021 $ 11.00 712,503 - 712,503 Series J Warrants 09/13/2016 09/13/2017 - (1) 185,000 185,000 - Series K Warrants 02/17/2017 2/17/2022 $ 0.60 6,250,000 160,000 6,090,000 Series L Warrants 02/17/2017 02/17/2018 - (1) 570,000 570,000 - Series M-A Warrants 02/17/2017 11/17/2017 - (1), (2) 2,305,000 1,485,000 - Series M-B Warrants 02/17/2017 11/17/2017 - (1), (3) 3,945,000 3,945,000 - 17,106,683 9,094,310 7,192,373

Note 7 - Accounts Payable and27

Note 7 - Accounts Payable and Accrued Liabilities (Tables)	3 Months Ended
	Mar. 31, 2018
Notes Tables
Schedule of Accounts Payable and Accrued Liabilities [Table Text Block]	March 31, December 31, 2018 2017 Accounts payable - trade $ 772 $ 666 Accrued legal-related fees 192 274 Accrued employee compensation 470 700 Accrued interest 416 434 Accrued production fees 353 447 Accrued utilities and supplies payable 833 677 Accrued taxes payable 358 172 Customer deposit - 436 Other accrued liabilities * 73 205 Total accounts payable and accrued liabilities $ 3,467 $ 4,011

Note 8 - Debt (Tables)

Note 8 - Debt (Tables)	3 Months Ended
	Mar. 31, 2018
Convertible 2020 Notes [Member]
Notes Tables
Schedule of Long-term Debt Instruments [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 - 252 - 252 - 252 Amortization of debt issue costs - - 67 67 - 67 Paid-in-kind interest 83 - - 83 - 83 Change in fair value of 2020 Notes embedded derivative - - - - (2,858 ) (2,858 ) Balance - March 31, 2018 $ 16,740 $ (2,249 ) $ (598 ) $ 13,893 $ 2,366 $ 16,259 Principal Amount of 2022 Notes Balance - December 31, 2017 $ 515 Exchange of 2022 Notes (515 ) Balance – March 31, 2018 $ —

Note 9 - Gevo Development (Tabl

Note 9 - Gevo Development (Tables)	3 Months Ended
	Mar. 31, 2018
Notes Tables
Schedule of Investments in and Advances to Affiliates, Schedule of Investments [Table Text Block]	Three Months Ended March 31, 2018 2017 Gevo Development Net Loss $ (2,517 ) $ (4,173 )

Note 10 - Stock-based Compens30

Note 10 - Stock-based Compensation (Tables)	3 Months Ended
	Mar. 31, 2018
Notes Tables
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block]	Three Months Ended March 31, 2018 2017 Stock options and employee stock purchase plan awards Research and development $ 9 $ 9 Selling, general and administrative 30 30 Restricted stock awards Research and development — 12 Selling, general and administrative — 17 Restricted stock units Research and development 17 18 Selling, general and administrative 41 42 Total stock-based compensation $ 97 $ 128

Note 11 - Commitments and Con31

Note 11 - Commitments and Contingencies (Tables)	3 Months Ended
	Mar. 31, 2018
Notes Tables
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]	Operating Leases 2018 (remaining) $ 1,094 2019 943 2020 430 2021 218 2022 and thereafter – Total $ 2,685

Note 12 - Fair Value Measurem32

Note 12 - Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2018
Notes Tables
Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]	Fair Value Measurements at March 31, 2018 (In thousands) Fair Value at March 31, 2018 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 $ 1,474 $ - $ - $ 1,474 2020 Embedded Derivative Liability 2,366 - - 2,366 Total Recurring Fair Value Measurements $ 3,840 $ - $ - $ 3,840 Nonrecurring Corn and finished goods inventory $ 1,835 $ 33 $ 1,802 $ - Total Non-Recurring Fair Value Measurements $ 1,835 $ 33 $ 1,802 $ - Fair Value Measurements at December 31, 2017 (In thousands) Fair Value at December 31, 2017 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 $ 1,951 $ – $ – $ 1,951 2020 Notes Embedded Derivative Liability 5,224 – – 5,224 Total Recurring Fair Value Measurements $ 7,175 $ – $ – $ 7,175 Nonrecurring Corn and finished goods inventory $ 1,916 $ 189 $ 1,727 $ – Total Non-Recurring Fair Value Measurements $ 1,916 $ 189 $ 1,727 $ –
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 Notes Embedded Derivative Opening Balance $ 1,951 $ 5,224 Transfers into Level 3 – – Transfers out of Level 3 – – Total (gains) or losses for the period Included in earnings (477 ) (2,858 ) Included in other comprehensive income – – Purchases, issues, sales and settlements Purchases – – Issues – – Sales – – Settlements – – Closing balance $ 1,474 $ 2,366

Note 13 - Segments (Tables)

Note 13 - Segments (Tables)	3 Months Ended
	Mar. 31, 2018
Notes Tables
Schedule of Segment Reporting Information, by Segment [Table Text Block]	Three Months Ended March 31, 2018 2017 Revenues: Gevo $ 25 $ 90 Gevo Development / Agri-Energy 8,218 5,526 Consolidated $ 8,243 $ 5,616 Loss from operations: Gevo $ (2,476 ) $ (3,065 ) Gevo Development / Agri-Energy (2,523 ) (4,117 ) Consolidated $ (4,999 ) $ (7,182 ) Interest expense: Gevo $ 825 $ 714 Gevo Development / Agri-Energy – – Consolidated $ 825 $ 714 Depreciation expense: Gevo $ 84 $ 137 Gevo Development / Agri-Energy 1,562 1,539 Consolidated $ 1,646 $ 1,676 Acquisitions of plant, property and equipment: Gevo $ – $ 56 Gevo Development / Agri-Energy 67 617 Consolidated $ 67 $ 673 March 31, December 31, 2018 2017 Total assets: Gevo $ 81,629 $ 87,507 Gevo Development / Agri-Energy 147,290 149,758 Intercompany eliminations (146,046 ) (148,412 ) Consolidated $ 82,873 $ 88,853

Note 1 - Nature of Business, 34

Note 1 - Nature of Business, Financial Condition, Basis of Presentation and Reverse Stock Split (Details Textual)	1 Months Ended	3 Months Ended
	Apr. 30, 2017USD ($)	Mar. 31, 2018USD ($)shares	Mar. 31, 2017USD ($)	Feb. 28, 2018USD ($)	Dec. 31, 2017USD ($)
Net Income (Loss) Attributable to Parent, Total		$ (2,502,000)	$ (5,934,000)
Retained Earnings (Accumulated Deficit), Ending Balance		(403,852,000)			$ (401,350,000)
Cash and Cash Equivalents, at Carrying Value, Ending Balance		7,029,000	20,393,000		$ 11,553,000
Proceeds from Issuance of Common Stock		57,000	$ 11,044,000
Operating Leases, Future Minimum Payments Due, Total		$ 2,685,000
Increase (Decrease) Restricted Cash Held as Collateral	$ (2,600,000)
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Ethanol [Member]
Concentration Risk, Percentage		74.00%	80.00%
Number of Customers		1
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Customer One [Member] | Ethanol [Member]
Concentration Risk, Percentage		100.00%
At-the-market Offering [Member]
Offering of Stock, Authorized Amount				$ 5,000,000
Stock Issued During Period, Shares, New Issues | shares		104,138
Proceeds from Issuance of Common Stock		$ 100,000
Payments of Stock Issuance Costs		200,000
Offering of Stock, Remaining Amount		4,900,000
At-the-market Offering [Member] | Sales Agent [Member]
Payments of Stock Issuance Costs		$ 1,000

Note 1 - Nature of Business, 35

Note 1 - Nature of Business, Financial Condition, Basis of Presentation and Reverse Stock Split - Cash and Restricted Cash (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Cash and cash equivalents	$ 7,029	$ 11,553	$ 20,393
Restricted cash			2,611
Total cash, cash equivalents, and restricted cash shown in the statement of cash flows.	$ 7,029	$ 11,553	$ 23,004	$ 30,499

Note 2 - Earnings Per Share (De

Note 2 - Earnings Per Share (Details Textual)	1 Months Ended
	May 10, 2018shares
Subsequent Event [Member]
Stock Issued During Period, Shares, New Issues	1,498,241

Note 2 - Earnings Per Share - S

Note 2 - Earnings Per Share - Securities that Potentially Dilute Calculation of Diluted Earnings Per Share (Details) - shares	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Antidilutive securities (in shares)	35,335,901	14,151,732
Warrant [Member]
Antidilutive securities (in shares)	7,192,373	14,017,373
Warrants Classified as Equity [Member]
Antidilutive securities (in shares)	1,393	1,393
Convertible 2017 Notes [Member]
Antidilutive securities (in shares)		47,827
Convertible 2020 Notes [Member]
Antidilutive securities (in shares)	28,093,500
Convertible 2022 Notes [Member]
Antidilutive securities (in shares)		688
Employee Stock Option [Member]
Antidilutive securities (in shares)	46,431	76,915
Restricted Stock [Member]
Antidilutive securities (in shares)	2,204	7,536

Note 3 - Revenues From Contra38

Note 3 - Revenues From Contracts With Customers Other Revenues (Details Textual) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Revenue from Contract with Customer, Including Assessed Tax	$ 8,243	$ 5,584
Contract with Customer, Liability, Total	0		$ 0
Contract with Customer, Asset, Credit Loss Expense	0		0
Contract with Customer, Asset, Net, Total	0		0
Transferred at Point in Time [Member]
Revenue from Contract with Customer, Including Assessed Tax	8,218	5,584
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 Contra39

Note 3 - Revenues From Contracts Wtih Customers Other Revenues - Dissagregated Revenues (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenue	$ 8,243	$ 5,584
Other revenues		32
Total revenues	8,243	5,616
UNITED STATES
Revenue	8,243	5,494
Other revenues		32
Total revenues	8,243	5,526
All Other Countries [Member]
Revenue		90
Other revenues
Total revenues		90
Gevo [Member]
Revenue	25	90
Other revenues
Total revenues	25	90
Gevo Development / Agri-Energy [Member]
Revenue	8,218	5,494
Other revenues		32
Total revenues	8,218	5,526
Transferred at Point in Time [Member]
Revenue	8,218	5,584
Other revenues
Total revenues	8,218	5,584
Transferred over Time [Member]
Revenue	25
Other revenues		32
Total revenues	25	32
Ethanol Sales and Related Products [Member]
Revenue	8,218	5,494
Other revenues
Total revenues	8,218	5,494
Hydrocarbon [Member]
Revenue		90
Other revenues
Total revenues		90
Grant and Other [Member]
Revenue	25
Other revenues		32
Total revenues	$ 25	$ 32

Note 4 - Inventories - Componen

Note 4 - Inventories - Components of Inventory Balances (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Finished goods:
Spare parts	$ 1,449	$ 1,405
Total inventories	4,356	4,362
Corn [Member]
Raw materials:
Raw materials	33	189
Enzymes and Other Inputs [Member]
Raw materials:
Raw materials	172	202
Nutrients [Member]
Raw materials:
Raw materials	5	5
Ethanol [Member]
Finished goods:
Finished goods	385	222
Isobutanol [Member]
Finished goods:
Finished goods	1,010	1,122
Jet Fuels, Isooctane and Isooctene [Member]
Finished goods:
Finished goods	908	524
Distiller's Grains [Member]
Finished goods:
Finished goods	23	59
Agri-Energy [Member]
Finished goods:
Work in process	226	197
Gevo [Member]
Finished goods:
Work in process	$ 145	$ 437

Note 5 - Property, Plant and 41

Note 5 - Property, Plant and Equipment (Details Textual) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cost, Depreciation	$ 1.6	$ 1.5
Depreciation, Nonproduction	$ 0.1	$ 0.1

Note 5 - Property, Plant and 42

Note 5 - Property, Plant and Equipment - Property, Plant and Equipment by Classification (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Property, plant, and equipment, gross	$ 111,681	$ 111,640
Less accumulated depreciation and amortization	(42,917)	(41,271)
Property, plant and equipment, net	68,764	70,369
Construction in Progress [Member]
Property, plant, and equipment, gross	507	479
Machinery and Equipment [Member]
Property, plant, and equipment, gross	$ 16,285	16,284
Property, plant and equipment, useful life (Year)	10 years
Site Improvement [Member]
Property, plant, and equipment, gross	$ 7,051	7,051
Property, plant and equipment, useful life (Year)	10 years
Retrofit Assets [Member]
Property, plant, and equipment, gross	$ 70,842	70,842
Property, plant and equipment, useful life (Year)	20 years
Lab Equipment, Furniture and Fixtures, and Vehicles [Member]
Property, plant, and equipment, gross	$ 6,513	6,513
Property, plant and equipment, useful life (Year)	5 years
Demonstration Plant [Member]
Property, plant, and equipment, gross	$ 3,597	3,597
Property, plant and equipment, useful life (Year)	2 years
Building [Member]
Property, plant, and equipment, gross	$ 2,543	2,543
Property, plant and equipment, useful life (Year)	10 years
Computer, Office Equipment, and Software [Member]
Property, plant, and equipment, gross	$ 1,807	1,795
Property, plant and equipment, useful life (Year)	3 years
Leasehold Improvements [Member]
Property, plant, and equipment, gross	$ 2,536	$ 2,536
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

Note 6 - Embedded Derivatives43

Note 6 - Embedded Derivatives and Derivative Warrant Liabilities (Details Textual) $ / shares in Units, $ in Thousands

1 Months Ended

3 Months Ended

6 Months Ended

60 Months Ended

Jan. 31, 2018USD ($)shares

Oct. 31, 2017$ / sharesshares

Sep. 30, 2017$ / sharesshares

Jun. 30, 2017

Dec. 31, 2013shares

Mar. 31, 2018USD ($)$ / sharesshares

Dec. 31, 2017USD ($)

Mar. 31, 2017USD ($)

Dec. 31, 2017USD ($)

Dec. 31, 2012$ / sharesshares

Apr. 19, 2017

Feb. 28, 2017shares

Sep. 30, 2016shares

Apr. 30, 2016shares

Dec. 31, 2015shares

May 31, 2015shares

Feb. 28, 2015shares

Aug. 31, 2014shares

Jul. 31, 2012

Embedded Derivative, Gain (Loss) on Embedded Derivative, Net, Total | $

$ 2,858

Class of Warrant or Right, Number of Securities Called by Warrants or Rights

7,192,373

[1]

17,106,683

Proceeds from Warrant Exercises | $

$ 2

Class of Warrant or Right, Issued During Period

1,393

Class of Warrant or Right, Exercised During Period

0

Minimum [Member]

Class of Warrant or Right, Issued During Period, Exercise Price | $ / shares

$ 17.70

Maximum [Member]

Class of Warrant or Right, Issued During Period, Exercise Price | $ / shares

$ 24.45

2013 Warrants [Member]

Warrants Issued to Purchase Additional Shares of Common Stock

71,013

Class of Warrant or Right, Number of Securities Called by Warrants or Rights

71,013

55,774

[1]

Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares

$ 8.99

2014 Warrants [Member]

Class of Warrant or Right, Number of Securities Called by Warrants or Rights

19,462

[1]

50,000

Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares

$ 6.83

Series A Warrants [Member]

Class of Warrant or Right, Number of Securities Called by Warrants or Rights

11,417

[1]

110,833

Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares

$ 0.68

Series B Warrants [Member]

Class of Warrant or Right, Number of Securities Called by Warrants or Rights

[1]

110,883

Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares

[2]

Series C Warrants [Member]

Class of Warrant or Right, Number of Securities Called by Warrants or Rights

21,500

[1]

21,500

Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares

$ 5.50

Series D Warrants [Member]

Class of Warrant or Right, Number of Securities Called by Warrants or Rights

930

[1]

502,500

Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares

$ 2

Series E Warrants [Member]

Class of Warrant or Right, Number of Securities Called by Warrants or Rights

[1]

400,000

Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares

[2]

Series F Warrants [Member]

Class of Warrant or Right, Number of Securities Called by Warrants or Rights

280,787

[1]

514,644

Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares

$ 2

Series H Warrants [Member]

Class of Warrant or Right, Number of Securities Called by Warrants or Rights

[1]

1,029,286

Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares

[2]

Series G Warrants [Member]

Class of Warrant or Right, Number of Securities Called by Warrants or Rights

[1]

328,571

Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares

[2]

Series I Warrants [Member]

Class of Warrant or Right, Number of Securities Called by Warrants or Rights

712,503

[1]

712,503

Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares

$ 11

Series J Warrants [Member]

Class of Warrant or Right, Number of Securities Called by Warrants or Rights

[1]

185,000

Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares

[2]

Series K Warrants [Member]

Class of Warrant or Right, Number of Securities Called by Warrants or Rights

6,090,000

[1]

6,250,000

Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares

$ 0.60

Series M Warrants [Member]

Warrants Issued to Purchase Additional Shares of Common Stock

1,485,000

3,945,000

Class of Warrant or Right, Number of Securities Called by Warrants or Rights

6,250,000

Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares

$ 0.60

Proceeds from Warrant Exercises | $

$ 1,000

$ 2,400

Series M Warrants [Member] | Minimum [Member]

Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares

$ 0.60

Series M Warrants [Member] | Maximum [Member]

Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares

$ 0.65

Series L Warrants [Member]

Class of Warrant or Right, Number of Securities Called by Warrants or Rights

[1]

570,000

Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares

[2]

Common Stock [Member]

Debt Conversion, Converted Instrument, Shares Issued

780,303

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 | $

$ 2,400

5,200

5,200

Embedded Derivative, Gain (Loss) on Embedded Derivative, Net, Total | $

Convertible 2020 Notes [Member] | Embedded Derivative, 2020 Convertible Notes [Member]

Embedded Derivative, Gain (Loss) on Embedded Derivative, Net, Total | $

$ 2,900

Convertible 2022 Notes [Member]

Debt Instrument, Interest Rate, Stated Percentage

7.50%

Embedded Derivative, Fair Value of Embedded Derivative, Net, Total | $

$ 0

$ 0

Debt Conversion, Original Debt, Amount | $

$ 500

Debt Conversion, Converted Instrument, Shares Issued

780,303

[1]

This table does not include 1,393 equity-classified warrants issued between 2008 through 2012, with strike prices between $17.70 and $24.45 per share.

[2]

Warrants have either been fully exercised and/or expired as of March 31, 2018.

Note 6 - Embedded Derivatives44

Note 6 - Embedded Derivatives and Derivative Warrant Liabilities - Schedule of Inputs to Lattice Model Used to Value Embedded Derivatives (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2018$ / sharesshares	Dec. 31, 2017$ / sharesshares	[1]
Stock price (in dollars per share)	$ 0.46	$ 0.59
Conversion Rate per $1,000 (in shares) | shares	1,358.9	1,358.9
Conversion Price (in dollars per share)	$ 0.74	$ 0.74
Maturity date	Mar. 15, 2020	Mar. 15, 2020
Measurement Input, Risk Free Interest Rate [Member]
Risk-free interest rate	2.24	1.89
Measurement Input, Price Volatility [Member]
Risk-free interest rate	75	75
Measurement Input, Entity Credit Risk [Member]
Risk-free interest rate	28	28
[1]	The June 20, 2017 inputs represent the initial valuation of the 2020 Notes Embedded Derivative instrument that arose due to the exchange of the 2017 Notes for the 2020 Notes.

Note 6 - Embedded Derivatives45

Note 6 - Embedded Derivatives and Derivative Warrant Liabilities - Schedule of Shares Issued Upon Exercise of Warrants (Details) - $ / shares		3 Months Ended
		Mar. 31, 2018		Feb. 28, 2017	Sep. 30, 2016	Apr. 30, 2016	Dec. 31, 2015	May 31, 2015	Feb. 28, 2015	Aug. 31, 2014	Dec. 31, 2013
Shares Underlying Warrants (in shares)		7,192,373	[1]	17,106,683
Shares Issues Upon Warrant Exercises (in shares)		9,094,310
2013 Warrants [Member]
Warrant, Issuance Date		Dec. 16, 2013
Warrants, Expiration date		Dec. 16, 2018
Warrant Exercise Price (in dollars per share)		$ 8.99
Shares Underlying Warrants (in shares)		55,774	[1]								71,013
Shares Issues Upon Warrant Exercises (in shares)		15,239
2014 Warrants [Member]
Warrant, Issuance Date		Aug. 5, 2014
Warrants, Expiration date		Aug. 5, 2019
Warrant Exercise Price (in dollars per share)		$ 6.83
Shares Underlying Warrants (in shares)		19,462	[1]							50,000
Shares Issues Upon Warrant Exercises (in shares)		30,538
Series A Warrants [Member]
Warrant, Issuance Date		Feb. 3, 2015
Warrants, Expiration date		Feb. 3, 2020
Warrant Exercise Price (in dollars per share)		$ 0.68
Shares Underlying Warrants (in shares)		11,417	[1]						110,833
Shares Issues Upon Warrant Exercises (in shares)		99,416
Series B Warrants [Member]
Warrant, Issuance Date		Feb. 3, 2015
Warrants, Expiration date		Aug. 3, 2015
Warrant Exercise Price (in dollars per share)	[2]
Shares Underlying Warrants (in shares)			[1]						110,883
Shares Issues Upon Warrant Exercises (in shares)		110,833
Series C Warrants [Member]
Warrant, Issuance Date		May 19, 2015
Warrants, Expiration date		May 19, 2020
Warrant Exercise Price (in dollars per share)		$ 5.50
Shares Underlying Warrants (in shares)		21,500	[1]					21,500
Shares Issues Upon Warrant Exercises (in shares)
Series D Warrants [Member]
Warrant, Issuance Date		Dec. 11, 2015
Warrants, Expiration date		Dec. 11, 2020
Warrant Exercise Price (in dollars per share)		$ 2
Shares Underlying Warrants (in shares)		930	[1]				502,500
Shares Issues Upon Warrant Exercises (in shares)		501,570
Series E Warrants [Member]
Warrant, Issuance Date		Dec. 11, 2015
Warrants, Expiration date		Dec. 11, 2020
Warrant Exercise Price (in dollars per share)	[2]
Shares Underlying Warrants (in shares)			[1]				400,000
Shares Issues Upon Warrant Exercises (in shares)		400,000
Series F Warrants [Member]
Warrant, Issuance Date		Apr. 1, 2016
Warrants, Expiration date		Apr. 1, 2021
Warrant Exercise Price (in dollars per share)		$ 2
Shares Underlying Warrants (in shares)		280,787	[1]			514,644
Shares Issues Upon Warrant Exercises (in shares)		233,857
Series G Warrants [Member]
Warrant, Issuance Date		Apr. 1, 2016
Warrants, Expiration date		Apr. 1, 2017
Warrant Exercise Price (in dollars per share)	[2]
Shares Underlying Warrants (in shares)			[1]			328,571
Shares Issues Upon Warrant Exercises (in shares)		328,571
Series H Warrants [Member]
Warrant, Issuance Date		Apr. 1, 2016
Warrants, Expiration date		Oct. 1, 2016
Warrant Exercise Price (in dollars per share)	[2]
Shares Underlying Warrants (in shares)			[1]			1,029,286
Shares Issues Upon Warrant Exercises (in shares)		1,029,286
Series I Warrants [Member]
Warrant, Issuance Date		Sep. 13, 2016
Warrants, Expiration date		Sep. 13, 2021
Warrant Exercise Price (in dollars per share)		$ 11
Shares Underlying Warrants (in shares)		712,503	[1]		712,503
Shares Issues Upon Warrant Exercises (in shares)
Series J Warrants [Member]
Warrant, Issuance Date		Sep. 13, 2016
Warrants, Expiration date		Sep. 13, 2017
Warrant Exercise Price (in dollars per share)	[2]
Shares Underlying Warrants (in shares)			[1]		185,000
Shares Issues Upon Warrant Exercises (in shares)		185,000
Series K Warrants [Member]
Warrant, Issuance Date		Feb. 17, 2017
Warrants, Expiration date		Feb. 17, 2022
Warrant Exercise Price (in dollars per share)		$ 0.60
Shares Underlying Warrants (in shares)		6,090,000	[1]	6,250,000
Shares Issues Upon Warrant Exercises (in shares)		160,000
Series L Warrants [Member]
Warrant, Issuance Date		Feb. 17, 2017
Warrants, Expiration date		Feb. 17, 2018
Warrant Exercise Price (in dollars per share)	[2]
Shares Underlying Warrants (in shares)			[1]	570,000
Shares Issues Upon Warrant Exercises (in shares)		570,000
Series M-A Warrants [Member]
Warrant, Issuance Date		Feb. 17, 2017
Warrants, Expiration date		Nov. 17, 2017
Warrant Exercise Price (in dollars per share)	[2],[3]
Shares Underlying Warrants (in shares)			[1]	2,305,000
Shares Issues Upon Warrant Exercises (in shares)		1,485,000
Series M-B Warrants [Member]
Warrant, Issuance Date		Feb. 17, 2017
Warrants, Expiration date		Nov. 17, 2017
Warrant Exercise Price (in dollars per share)	[2],[4]
Shares Underlying Warrants (in shares)			[1]	3,945,000
Shares Issues Upon Warrant Exercises (in shares)		3,945,000
[1]	This table does not include 1,393 equity-classified warrants issued between 2008 through 2012, with strike prices between $17.70 and $24.45 per share.
[2]	Warrants have either been fully exercised and/or expired as of March 31, 2018.
[3]	In October 2017, 1,485,000 Series M warrants were repriced between $0.60 and $0.65 per warrant. Of those warrants that were repriced, all were exercised in the fourth quarter of 2017, providing proceeds of $1.0 million.
[4]	In September 2017, 3,945,000 Series M warrants were repriced to $0.60. Of those warrants that were repriced, all were exercised in the second half of 2017, providing proceeds of $2.4 million.

Note 7 - Accounts Payable and46

Note 7 - Accounts Payable and Accrued Liabilities - Components Accounts Payable and Accrued Liabilities in Consolidated Balance Sheets (Details) - USD ($) $ in Thousands		Mar. 31, 2018	Dec. 31, 2017
Accounts payable - trade		$ 772	$ 666
Accrued legal-related fees		192	274
Accrued employee compensation		470	700
Accrued interest		416	434
Accrued production fees		353	447
Accrued utilities and supplies payable		833	677
Accrued taxes payable		358	172
Customer deposit			436
Other accrued liabilities *	[1]	73	205
Total accounts payable and accrued liabilities		$ 3,467	$ 4,011
[1]	Other accrued liabilities consist of franchise taxes, audit fees, and a variety of other expenses, none of which individually represent greater than five percent of total current liabilities.

Note 8 - Debt (Details Textual)

Note 8 - Debt (Details Textual) - USD ($)	Apr. 19, 2017	Jan. 31, 2018	Jul. 31, 2012	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	[1]	Jun. 30, 2017
Debt Instrument, Convertible, Conversion Price				$ 0.74		$ 0.74
Amortization of Debt Issuance Costs and Discounts, Total				$ 402,000	$ 80,000
Interest Expense, Debt, Total				825,000	714,000
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	$ 0.7359
Debt Instrument, Convertible, Conversion Ratio	1.3589
Beneficial Ownership Limitation, Percentage	4.99%
Beneficial Ownership Limitation Percentage, Notice	61 days
Beneficial Ownership Limitation After Notice, Percentage	9.99%
Convertible 2020 Notes [Member] | Debt Instrument Exchange Period One [Member]
Debt Instrument, Convertible, Conversion Price Reset Period	90 days
Debt Instrument, Convertible, Conversion Price Premium Percentage on Common Stock Share Price in Equity Financing	25.00%
Convertible 2020 Notes [Member] | Debt Instrument Exchange Period Two [Member]
Debt Instrument, Convertible, Conversion Price Premium Percentage on Common Stock Share Price in Equity Financing	35.00%
Convertible 2020 Notes [Member] | Debt Instrument Exchange Period Two [Member] | Minimum [Member]
Debt Instrument, Convertible, Conversion Price Reset Period	90 days
Convertible 2020 Notes [Member] | Debt Instrument Exchange Period Two [Member] | Maximum [Member]
Debt Instrument, Convertible, Conversion Price Reset Period	180 days
Convertible 2022 Notes [Member]
Debt Instrument, Interest Rate, Stated Percentage			7.50%
Debt Instrument, Face Amount			$ 45,000,000
Proceeds from Convertible Debt			40,900,000
Discount on Sale of Convertible Notes			2,700,000
Debt Issuance Costs, Gross			$ 1,400,000
Debt Instrument, Interest Rate, Effective Percentage			7.50%
Amortization of Debt Issuance Costs and Discounts, Total				0	80,000
Expenses Related to Debt Conversion				20,000	1,200,000
Interest Expense, Debt, Total				$ 0	$ 20,000
Debt Discounts and Debt Issue Costs Amortization Rate				40.00%
Debt Instrument, Convertible, Remaining Discount Amortization Period				5 years
Debt Conversion, Original Debt, Amount		$ 500,000
Debt Conversion, Converted Instrument, Shares Issued		780,303
2020 Option Notes [Member]
Debt Instrument, Convertible, Additional Convertible Amount	$ 5,000,000
Debt Instrument, Purchase Option Term	90 days
Debt Instrument, Gain (Loss) on Exchange or Conversion	$ (4,000,000)
[1]	The June 20, 2017 inputs represent the initial valuation of the 2020 Notes Embedded Derivative instrument that arose due to the exchange of the 2017 Notes for the 2020 Notes.

Note 8 - Debt - Information Per

Note 8 - Debt - Information Pertaining to 2020 Notes (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net, Total	$ 2,858
Embedded Derivative, 2020 Convertible Notes [Member]
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net, Total	(2,858)
Balance - March 31, 2018	2,366
Balance - December 31, 2017	5,224
Convertible 2020 Notes [Member]
Amortization of debt discount	252
Paid-in-kind interest	83
Amortization of debt issue costs	67
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net, Total
Balance - March 31, 2018	13,893
Balance - December 31, 2017	13,491
Balance - March 31, 2018	2,400
Balance - December 31, 2017	5,200
Convertible 2020 Notes [Member] | Embedded Derivative, 2020 Convertible Notes [Member]
Amortization of debt discount	252
Paid-in-kind interest	83
Amortization of debt issue costs	67
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net, Total	(2,858)
Balance - March 31, 2018	16,259
Balance - December 31, 2017	18,715
Convertible 2020 Notes [Member] | Principal Amount of 2020 Notes [Member]
Balance - December 31, 2017	16,657
Paid-in-kind interest	83
Balance – March 31, 2018	16,740
Convertible 2020 Notes [Member] | Debt Issue Costs [Member]
Amortization of debt discount	252
Balance - March 31, 2018	(2,249)
Balance - December 31, 2017	(2,501)
Convertible 2020 Notes [Member] | Debt Discount [Member]
Amortization of debt issue costs	67
Balance - March 31, 2018	(598)
Balance - December 31, 2017	(665)
Convertible 2022 Notes [Member]
Balance - December 31, 2017	0
Convertible 2022 Notes [Member] | Principal Amount of 2022 Notes [Member]
Balance - December 31, 2017	515
Exchange of 2022 Notes	(515)
Balance – March 31, 2018

Note 9 - Gevo Development (Deta

Note 9 - Gevo Development (Details Textual) - Gevo Development [Member] - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Capital Contribution to Subsidiaries	$ 1.3	$ 8.9
Equity Ownership of Wholly Owned Subsidiary	100.00%

Note 9 - Gevo Development - Net

Note 9 - Gevo Development - Net Loss Incurred by Gevo Development (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Gevo Development [Member]
Gevo Development Net Loss	$ (2,517)	$ (4,173)

Note 10 - Stock-based Compens51

Note 10 - Stock-based Compensation - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Stock-based compensation	$ 97	$ 128
Stock Options Issued to Employees and Board Members [Member] | Research and Development Expense [Member]
Stock-based compensation	9	9
Stock Options Issued to Employees and Board Members [Member] | Selling, General and Administrative Expenses [Member]
Stock-based compensation	30	30
Restricted Stock [Member] | Research and Development Expense [Member]
Stock-based compensation		12
Restricted Stock [Member] | Selling, General and Administrative Expenses [Member]
Stock-based compensation		17
Restricted Stock Units (RSUs) [Member] | Research and Development Expense [Member]
Stock-based compensation	17	18
Restricted Stock Units (RSUs) [Member] | Selling, General and Administrative Expenses [Member]
Stock-based compensation	$ 41	$ 42

Note 11 - Commitments and Con52

Note 11 - Commitments and Contingencies (Details Textual) - USD ($) $ in Thousands	Apr. 02, 2018	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2012	Dec. 31, 2017	Dec. 31, 2016
Operating Leases, Rent Expense, Net, Total		$ 400	$ 400
Accrual for Environmental Loss Contingencies, Ending Balance		0			$ 0
Indemnification Agreement [Member]
Loss Contingency Accrual, Ending Balance		0			0
Other Noncurrent Liabilities [Member]
Capital Lease Obligations, Total		$ 0			$ 0	$ 100
Assets Held under Capital Leases [Member]
Capital Lease Agreement Period				6 years
Software Licensing Agreement [Member] | Subsequent Event [Member]
Capital Lease Agreement Period	5 years
Capital Leases, Future Minimum Payments Due, Total	$ 600

Note 11 - Commitments and Con53

Note 11 - Commitments and Contingencies - Future Minimum Payments Under Non-Cancelable Operating Leases (Details) $ in Thousands	Mar. 31, 2018USD ($)
Operating Leases, 2017 (remaining)	$ 1,094
Operating Leases, 2019	943
Operating Leases, 2020	430
Operating Leases, 2021	218
Operating Leases, 2022 and thereafter
Operating Leases, Total	$ 2,685

Note 12 - Fair Value Measurem54

Note 12 - Fair Value Measurements (Details Textual) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Warrants and Rights Outstanding	$ 1,474	$ 1,951
Monte Carlo Model [Member] | Series K Warrants [Member] | Fair Value, Inputs, Level 3 [Member]
Warrants and Rights Outstanding	1,500
Convertible 2020 Notes [Member]
Embedded Derivative, Fair Value of Embedded Derivative, Net, Total	$ 2,400	$ 5,200

Note 12 - Fair Value Measurem55

Note 12 - Fair Value Measurements - Schedule of Carrying Value and Fair Value by Fair Value Hierarchy of Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Measurements, Recurring [Member]
Liabilities, fair value	$ 3,840	$ 7,175
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Liabilities, fair value
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Liabilities, fair value
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Liabilities, fair value	3,840	7,175
Fair Value, Measurements, Recurring [Member] | Warrant [Member]
Liabilities, fair value	1,474	1,951
Fair Value, Measurements, Recurring [Member] | Warrant [Member] | Fair Value, Inputs, Level 1 [Member]
Liabilities, fair value
Fair Value, Measurements, Recurring [Member] | Warrant [Member] | Fair Value, Inputs, Level 2 [Member]
Liabilities, fair value
Fair Value, Measurements, Recurring [Member] | Warrant [Member] | Fair Value, Inputs, Level 3 [Member]
Liabilities, fair value	1,474	1,951
Fair Value, Measurements, Recurring [Member] | Embedded Derivative [Member]
Liabilities, fair value	2,366	5,224
Fair Value, Measurements, Recurring [Member] | Embedded Derivative [Member] | Fair Value, Inputs, Level 1 [Member]
Liabilities, fair value
Fair Value, Measurements, Recurring [Member] | Embedded Derivative [Member] | Fair Value, Inputs, Level 2 [Member]
Liabilities, fair value
Fair Value, Measurements, Recurring [Member] | Embedded Derivative [Member] | Fair Value, Inputs, Level 3 [Member]
Liabilities, fair value	2,366	5,224
Fair Value, Measurements, Nonrecurring [Member]
Assets, fair value	1,835	1,916
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member]
Assets, fair value	33	189
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member]
Assets, fair value	1,802	1,727
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]
Assets, fair value
Fair Value, Measurements, Nonrecurring [Member] | Corn and Finished Goods Inventory [Member]
Assets, fair value	1,835	1,916
Fair Value, Measurements, Nonrecurring [Member] | Corn and Finished Goods Inventory [Member] | Fair Value, Inputs, Level 1 [Member]
Assets, fair value	33	189
Fair Value, Measurements, Nonrecurring [Member] | Corn and Finished Goods Inventory [Member] | Fair Value, Inputs, Level 2 [Member]
Assets, fair value	1,802	1,727
Fair Value, Measurements, Nonrecurring [Member] | Corn and Finished Goods Inventory [Member] | Fair Value, Inputs, Level 3 [Member]
Assets, fair value

Note 12 - Fair Value Measurem56

Note 12 - Fair Value Measurements - Schedule of Fair Value Measurements Using Level 3 Inputs (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018USD ($)
Derivative Financial Instruments, Liabilities [Member]
Opening Balance	$ 1,951
Transfers into Level 3
Transfers out of Level 3
Included in earnings	(477)
Included in other comprehensive income
Purchases, issues, sales and settlements
Purchases
Issues
Sales
Settlements
Closing balance	1,474
Convertible 2017 Notes [Member]
Opening Balance	5,224
Transfers into Level 3
Transfers out of Level 3
Included in earnings	(2,858)
Included in other comprehensive income
Purchases, issues, sales and settlements
Purchases
Issues
Sales
Settlements
Closing balance	$ 2,366

Note 13 - Segments (Details Tex

Note 13 - Segments (Details Textual)	3 Months Ended
	Mar. 31, 2018
Number of Operating Segments	2

Note 13 - Segments - Informatio

Note 13 - Segments - Information on Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Total revenues	$ 8,243	$ 5,616
Loss from operations	(4,999)	(7,182)
Interest expense	825	714
Depreciation and amortization	1,646	1,676
Acquisitions of plant, property and equipment	67	673
Assets	82,873		$ 88,853
Intersegment Eliminations [Member]
Assets	(146,046)		(148,412)
Gevo [Member]
Total revenues	25	90
Loss from operations	(2,476)	(3,065)
Interest expense	825	714
Depreciation and amortization	84	137
Acquisitions of plant, property and equipment		56
Gevo [Member] | Operating Segments [Member]
Assets	81,629		87,507
Gevo Development / Agri-Energy [Member]
Total revenues	8,218	5,526
Loss from operations	(2,523)	(4,117)
Interest expense
Depreciation and amortization	1,562	1,539
Acquisitions of plant, property and equipment	67	$ 617
Gevo Development / Agri-Energy [Member] | Operating Segments [Member]
Assets	$ 147,290		$ 149,758