Gevo (GEVO) 10-K 28 Mar 19 2018 FY Annual report Financial data

Document And Entity Information

Document And Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Feb. 28, 2019	Jun. 29, 2018
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 Common Stock, Shares Outstanding (in shares)		11,658,387
Entity Public Float			$ 30.4
Entity Shell Company	false
Document Type	10-K
Document Period End Date	Dec. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	FY
Amendment Flag	false

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands		Dec. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents		$ 33,734	$ 11,553
Accounts receivable		526	1,054
Inventories		3,166	4,362
Prepaid expenses and other current assets		1,284	712
Total current assets		38,710	17,681
Property, plant and equipment, net		67,036	70,369
Deposits and other assets		1,289	803
Total assets	[1]	107,035	88,853
Current liabilities:
Accounts payable and accrued liabilities		4,874	4,011
2020 Notes embedded derivative liability		394	5,224
Derivative warrant liability		22	1,951
Total current liabilities		5,290	11,186
Other long-term liabilities		404	130
Total liabilities		18,248	25,322
Commitments and Contingencies (see Note 18)
Stockholders' Equity
Common stock, $0.01 par value per share; 250,000,000 authorized; 8,640,583 and 1,090,553 shares issued and outstanding at December 31, 2018 and 2017, respectively. (See Note 2)		86	11
Additional paid-in capital		518,027	464,870
Accumulated deficit		(429,326)	(401,350)
Total stockholders' equity		88,787	63,531
Total liabilities and stockholders' equity		107,035	88,853
Convertible 2020 Notes [Member]
Current liabilities:
Notes		12,554	13,491
Convertible 2022 Notes [Member]
Current liabilities:
Notes			$ 515
[1]	All other significant non-cash items relate to the activities of Gevo.

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parentheticals) - $ / shares	Dec. 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)	8,640,583	1,090,553
Common stock, shares outstanding (in shares)	8,640,583	1,090,553

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenue	$ 32,863	$ 27,308	$ 26,542
Grant and other revenue	25	228	671
Total revenues	32,863	27,536	27,213
Cost of goods sold	41,568	38,165	37,017
Gross loss	(8,705)	(10,629)	(9,804)
Operating expenses
Research and development expense	5,374	5,182	5,216
Selling, general and administrative expense	8,122	7,471	8,965
Total operating expenses	13,496	12,653	14,181
Loss from operations	(22,201)	(23,282)	(23,985)
Other (expense) income
Interest expense	(3,237)	(2,951)	(7,837)
(Loss) on exchange or conversion of debt	(2,202)	(4,933)	(763)
(Loss)/Gain on extinguishment of warrant liability			(918)
Gain from change in fair value of 2020 Notes embedded derivative	2,637	1,751
(Loss)/Gain from change in fair value of derivative warrant liability	(2,976)	5,101	1,783
(Loss) from change in fair value of 2017 Notes		(339)	(4,204)
Loss on issuance of equity			(1,519)
Other income	3	23	215
Total other (expense) income	(5,775)	(1,348)	(13,243)
Net loss	$ (27,976)	$ (24,630)	$ (37,228)
Net loss per share - basic and diluted (in dollars per share)	$ (5.74)	$ (30.23)	$ (193.52)
Weighted-average number of common shares outstanding - basic and diluted (in shares)	4,876,897	814,797	192,372
Ethanol Sales and Related Products [Member]
Revenue	$ 31,641	$ 26,279	$ 24,613
Total revenues	31,641	26,279	24,613
Hydrocarbon [Member]
Revenue	1,197	1,029	1,929
Total revenues	$ 1,197	$ 1,029	$ 1,929

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
Beginning Balance (in shares) at Dec. 31, 2015	54,018
Beginning Balance at Dec. 31, 2015	$ 1	$ 387,817	$ (339,492)	$ 48,326
Issuance of common stock under stock plans, net (in shares)	139
Issuance of common stock under stock plans, net
Issuance of common stock, net of issue costs & warrants (in shares)	124,005
Issuance of common stock, net of issue costs & warrants	$ 1	34,223		34,224
Non-cash stock-based compensation		886		886
Issuance of common stock upon exercise of warrants (in shares)	127,961
Issuance of common stock upon exercise of warrants	$ 1	12,297		12,298
Issuance of common stock upon exchange or conversion of debt (in shares)	47,589
Issuance of common stock upon exchange or conversion of debt		10,758		10,758
Net loss			(37,228)	(37,228)
Ending Balance (in shares) at Dec. 31, 2016	353,712
Ending Balance at Dec. 31, 2016	$ 4	445,980	(376,720)	69,264
Issuance of common stock under stock plans, net (in shares)	150
Issuance of common stock under stock plans, net
Issuance of common stock, net of issue costs & warrants (in shares)	284,000
Issuance of common stock, net of issue costs & warrants	$ 3	6,392		6,395
Non-cash stock-based compensation		421		421
Issuance of common stock upon exercise of warrants (in shares)	308,000
Issuance of common stock upon exercise of warrants	$ 3	3,426		3,429
Issuance of common stock upon exchange or conversion of debt (in shares)	144,691
Issuance of common stock upon exchange or conversion of debt	$ 1	8,651		8,652
Net loss			(24,630)	(24,630)
Ending Balance (in shares) at Dec. 31, 2017	1,090,553
Ending Balance at Dec. 31, 2017	$ 11	464,870	(401,350)	63,531
Issuance of common stock under stock plans, net (in shares)	119
Issuance of common stock under stock plans, net
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 or conversion of debt (in shares)	299,809
Issuance of common stock upon exchange or conversion of debt	$ 3	7,544		7,547
Net loss			(27,976)	(27,976)
Shares issued upon reverse stock split (in shares)	12,261
Ending Balance (in shares) at Dec. 31, 2018	8,640,583
Ending Balance at Dec. 31, 2018	$ 86	$ 518,027	$ (429,326)	$ 88,787

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating Activities
Net loss	$ (27,976,000)	$ (24,630,000)	$ (37,228,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Loss/(Gain) from the change in fair value of derivative warrant liability	2,976,000	(5,101,000)	(1,783,000)
(Gain) from the change in fair value of the embedded derivative to the 2020 Notes	(2,637,000)	(1,751,000)
Loss from the change in fair value of 2017 Notes		339,000	4,204,000
Loss on exchange or conversion of debt	2,202,000	4,933,000	763,000
Loss on extinguishment of warrant liability			918,000
Loss on issuance of equity			1,519,000
Stock-based compensation	571,000	421,000	886,000
Depreciation and amortization	6,520,000	6,641,000	6,747,000
Non-cash interest expense	1,706,000	962,000	3,977,000
Other non-cash expenses	6,000		(1,000)
Changes in operating assets and liabilities:
Accounts receivable	528,000	68,000	269,000
Inventories	1,196,000	(904,000)	29,000
Prepaid expenses and other current assets	(630,000)	137,000	(119,000)
Accounts payable, accrued expenses, and long-term liabilities	(313,000)	(1,742,000)	(697,000)
Net cash used in operating activities	(15,851,000)	(20,627,000)	(20,516,000)
Investing Activities
Acquisitions of property, plant and equipment	(2,233,000)	(1,906,000)	(5,938,000)
Proceeds from sales tax refund for property, plant and equipment
Net cash used in investing activities	(2,233,000)	(1,906,000)	(5,938,000)
Financing Activities
Payments on secured debt		(9,791,000)	(504,000)
Debt and equity offering costs	(392,000)	(1,095,000)	(3,144,000)
Proceeds from issuance of common stock and common stock warrants	39,394,000	11,044,000	28,661,000
Proceeds from the exercise of warrants	1,263,766	3,429,000	12,298,000
Net cash provided by financing activities	40,265,000	3,587,000	37,311,000
Net increase (decrease) in cash and cash equivalents	22,181,000	(18,946,000)	10,857,000
Beginning of year	11,553,000	30,499,000	19,642,000
Ending of year	33,734,000	11,553,000	30,499,000
Conversion and exchanges of convertible debt for common stock	3,701,000	8,652,000	10,758,000
Cash paid for interest	1,945,000	2,554,000	3,694,000
Non-cash purchase of property, plant and equipment	919,000	27,000	513,000
Discount due to exchange of 2017 Notes for 2020 Notes		3,009,000
Fair value of 2020 Notes embedded derivative upon exchange	2,193,000	6,975,000
Fair value of warrants at issuance and upon exercise, net	$ 4,905,000	$ (4,353,000)	$ 6,668,000

Note 1 - Nature of Business and

Note 1 - Nature of Business and Financial Condition	12 Months Ended
	Dec. 31, 2018
Notes to Financial Statements
Business Description and Basis of Presentation [Text Block]	1. Nature of Business In addition to its ethanol production capabilities, 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. 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 production facility located in Luverne, Minnesota (the "Luverne Facility") has production capacity of about 20 45 50 3 As of December 31, 2018, Financial Condition December 31, 2018 2017, $28.0 $24.6 $429.3 December 31, 2018. December 31, 2018 $33.7 (iv) exploration of strategic alternatives and new financings; 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 At-the-Market Offering Program. February 2018, 2018 $84.9 December 31, 2018, $44.6 During the year ended December 31, 2018, 6,936,930 $40.3 $0.9 $0.5 December 31, 2018. three December 31, 2018, 545,313 $2.5 $0.1 $0.1 The Company issued and sold 3,244,941 $9.9 December 31, 2018. 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, 2018
Notes to Financial Statements
Significant Accounting Policies [Text Block]	2. Principles of Consolidation Basis of Presentation. December 31, 2018. Use of Estimates Concentrations of Credit Risk Cash and Cash Equivalents three Accounts Receivable . The Company records receivables for products shipped and services provided but for which payment has not December 31, 201 8 and 201 7 , no December 31, 201 8 , one comprised 66% of the Company's outstanding trade accounts receivable. As of December 31, 2017 , one C&N Ethanol Marketing, LLC ("C&N Ethanol"), comprised 78 % of the Company's outstanding trade accounts receivable. Inventories 2015 11 Derivative Instruments 7 8 Consolidated Statement of Operations Consolidated Statement of Operation. As of December 31, 201 8 and 201 7 , the Company did not outside those probable of being used by the Company over a reasonable period in the normal course of business. 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, 2018 2017. • sales price of isobutanol, hydrocarbons, ethanol and by-products such as dried distiller’s 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, 2018 2017, not may may 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 were deducted from the gross sales price at the time payment was remitted. Ethanol and related products sales were recorded net of commissions and shipping and handling costs. 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 the lease agreements are recognized on a straight-line basis over the term of the contract. For the year ended December 31, 2018, accounted for approximately 72 % of the Company's consolidated revenue. For the years ended December 31, 2017 and 2016, 76 % and 71% 21%, 17% 17% see Note 18 ). Given the production capacity compared to the overall size of the North American market and the fungible demand for the Company's products, the Company does not Cost of Goods Sold Patents December 31, 2018, 2017 2016 $0.2 $0.3 $0.2 Research and Development third Income Taxes not not December 31, 2018 2017, $110.9 $107.4 Stock-Based Compensation four Net Loss Per Share December 31, 2018, 2017, 2016 The following table sets forth securities that could potentially dilute the calculation of diluted earnings per share. This table excludes any shares that could potentially be issued in settlement of make-whole payments associated with the 2020 2022 Year Ended December 31, 201 8 201 7 201 6 Warrants to purchase common stock - liability classified 55,963 359,619 55,119 Warrants to purchase common stock - equity classified 6 70 70 Convertible 2017 Notes – – 3,756 Convertible 2020 Notes 1,071,674 1,437,984 – Convertible 2022 Notes – – 280 Outstanding options to purchase common stock 2,311 2,322 846 Unvested restricted common stock 290,300 155 441 Stock appreciation rights 132,559 – – Total 1,552,813 1,800,150 60,512 Recent Accounting Pronouncements Leases (“ASU 2016 02” . In February 2016, No. 2016 - 02, 842 . ASU 2016 02 2016 02 is effective for fiscal years beginning after December 15, 2018, December 31, 2018 $2.2 2016 02 January 1, 2019 While the Company has not 2016 02 $1 $1.5 not 12 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, 2017. April 2016, ASU No. 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 initial assessment on how this standard will impact the aforementioned sources of revenue. Ethanol sales and related products revenues, net. no 100 December 31, 2018, 2017 2016 72%, 76% 71% December 31, 2018, 2017 2016, no December 31, 2018, 2017 2016. no Hydrocarbon revenue. no no 2014 09 January 1, 2018. Grant and other revenues. Northwest Advanced Renewables Alliance 2014. not 606 Revenues from Contracts with Customers” 2014 09. 606, no 2014 09. Statement of Cash Flows – Restricted Cash (“ASU 2016 18” November 2016, No. 2016 18, Statement of Cash Flows Restricted Cash December 15, 2017. $2.6 2017 2020 June 2017 9 not April 2017 2017 no

Note 3 - Revenues From Contract

Note 3 - Revenues From Contracts With Customers Other Revenues	12 Months Ended
	Dec. 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, net. no Hydrocarbon revenue. no Grant and other revenues. 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 Year Ended December 31, 2018 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 Operating Segment Gevo $ 1,222 $ - $ 1,222 Gevo Development / Agri-Energy 31,641 - 31,641 $ 32,863 $ - $ 32,863 Geographic Region United States $ 31,688 $ - $ 31,688 Other 1,176 - 1,176 $ 32,863 $ - $ 32,863 Year Ended December 31, 2017 Major Goods/Service Line Revenues from Contracts with Customers Other Revenues Total Ethanol sales and related products, net $ 26,279 $ - $ 26,279 Hydrocarbon revenue 1,029 - 1,029 Grant and other revenue - 228 228 $ 27,308 $ 228 $ 27,536 Timing of Revenue Recognition Goods transferred at a point in time $ 27,308 $ - $ 27,308 Services transferred over time - 228 228 $ 27,308 $ 228 $ 27,536 Operating Segment Gevo $ 1,029 $ 68 $ 1,097 Gevo Development / Agri-Energy 26,279 160 26,439 $ 27,308 $ 228 $ 27,536 Geographic Region United States $ 26,324 $ 228 $ 26,552 Other 984 - 984 $ 27,308 $ 228 $ 27,536 Year Ended December 31, 2016 Major Goods/Service Line Revenues from Contracts with Customers Other Revenues Total Ethanol sales and related products, net $ 24,613 $ - $ 24,613 Hydrocarbon revenue 1,929 - 1,929 Grant and other revenue - 671 671 $ 26,542 $ 671 $ 27,213 Timing of Revenue Recognition Goods transferred at a point in time $ 26,542 $ - $ 26,542 Services transferred over time - 671 671 $ 26,542 $ 671 $ 27,213 Operating Segment Gevo $ 1,929 $ 496 $ 2,425 Gevo Development / Agri-Energy 24,613 175 24,788 $ 26,542 $ 671 $ 27,213 Geographic Region United States $ 24,654 $ 671 $ 25,325 Other 1,889 - 1,889 $ 26,542 $ 671 $ 27,213 Goods transferred at a point-in-time. December 31, 2018, 2017 2016, no December 31, 2018, 2017, 2016, 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, 2018, 2017 2016, no December 31, 2018, 2017, 2016, no For the years ended December 2018, 2017 2016, Contract Assets and Trade Receivables. December 31, 2018, 2017 2016, no not no not December 31, 2018, 2017 2016,

Note 4 - Inventories

Note 4 - Inventories	12 Months Ended
	Dec. 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). December 31, 201 8 201 7 Raw materials Corn $ 29 $ 189 Enzymes and other inputs 204 202 Nutrients - 5 Finished goods Ethanol 182 222 Isobutanol 549 1,122 Jet Fuels, Isooctane and Isooctene 394 524 Distiller's grains 54 59 Work in process - Agri Energy 214 197 Work in process - Gevo 89 437 Spare parts 1,451 1,405 Total inventories $ 3,166 $ 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	12 Months Ended
	Dec. 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). December 31, (in years) 201 8 201 7 Construction in progress – $ 3,478 $ 479 Plant machinery and equipment 10 16,285 16,284 Site improvements 10 7,055 7,051 Agri-Energy Retrofit asset 20 70,842 70,842 Lab equipment, furniture and fixtures and vehicles 5 6,574 6,513 Demonstration plant 2 3,597 3,597 Buildings 10 2,543 2,543 Computer, office equipment and software 3 1,848 1,795 Leasehold improvements, pilot plant, land and support equipment 2 — 5 2,542 2,536 Total property, plant and equipment 114,764 111,640 Less accumulated depreciation and amortization (47,728 ) (41,271 ) Property, plant and equipment, net $ 67,036 $ 70,369 The Company had no December 31, 2018 2017, The Company recorded $6.5 $6.6 $6.7 December 31, 2018, 2017, 2016, $6.3 $6.2 $6.0 December 31, 2018, 2017 2016

Note 6 - Accounts Payable and A

Note 6 - Accounts Payable and Accrued Liabilities	12 Months Ended
	Dec. 31, 2018
Notes to Financial Statements
Accounts Payable and Accrued Liabilities Disclosure [Text Block]	6. 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, 201 8 201 7 Accounts payable - trade $ 1,944 $ 666 Accrued legal-related fees 206 274 Accrued employee compensation 1,648 700 Accrued interest - 434 Accrued production fees 255 447 Accrued utilities payable 344 677 Accrued taxes payable 101 172 Customer deposit - 436 Other accrued liabilities * 376 205 Total accounts payable and accrued liabilities $ 4,874 $ 4,011 * Other accrued liabilities consist of franchise taxes, audit fees, and a variety of other expenses, none five

Note 7 - Embedded Derivatives

Note 7 - Embedded Derivatives	12 Months Ended
	Dec. 31, 2018
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 Upon issuance on June 20, 2017, $7.0 December 31, 2018, $0.4 $2.6 December 31, 2018. The following table sets forth the inputs to the lattice model that were used to value the embedded derivatives. December 31, December 31,, 2018 2017 Stock price $ 1.96 $ 11.80 Conversion Rate 67.95 1,358.90 Conversion Price $ 14.72 $ 14.72 Maturity date March 15, 2020 March 15, 2020 Risk-free interest rate 2.57 % 1.89 % Estimated stock volatility 150 % 75 % Estimated credit spread 31 % 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, 2018, 2022 January 2018, 2022 $0.5 2022 39,016 2022 no 2022 2022

Note 8 - Derivative Warrant Lia

Note 8 - Derivative Warrant Liability	12 Months Ended
	Dec. 31, 2018
Notes to Financial Statements
Derivative Instruments and Hedging Activities Disclosure [Text Block]	8. The following sets forth information pertaining to shares underlying warrants outstanding as of December 31, 2018: Issuance Date Expiration Date Exercise Price as of December 31, 2018 Shares Underlying Warrants on Issuance Date Shares Issued upon Warrant Exercises as of December 31, 2018 Shares Underlying Warrants Outstanding as of December 31, 2018 2014 Warrants 08/05/2014 08/05/2019 $ 65.50 2,500 1,526 974 Series A Warrants 02/03/2015 02/03/2020 $ 3.80 5,542 5,222 320 Series C Warrants 05/19/2015 05/19/2020 $ 53.43 1,075 – 1,075 Series D Warrants 12/11/2015 12/11/2020 $ 40.00 25,125 25,078 47 Series F Warrants 04/01/2016 04/01/2021 $ 40.00 25,733 11,692 14,041 Series I Warrants 09/13/2016 09/13/2021 $ 220.00 35,650 – 35,650 Series K Warrants 02/17/2017 2/17/2022 $ 3.80 312,516 308,660 3,856 408,141 352,178 55,963 ( 1 This table does not 2011, 6 $345 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 (as 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 warrant is not 30 Based on these terms, the Company has determined that all warrants issued since 2013 $0.02 $2.0 December 31, 2018 December 31, 2017, December 31, 2018 During the twelve December 31, 2018, Twelve Months Ended December 31, 201 8 Common Stock Issued Proceeds Series A Warrants 251 1,054 Series K Warrants 300,660 1,262,712 300,911 $ 1,263,766

Note 9 - Debt

Note 9 - Debt	12 Months Ended
	Dec. 31, 2018
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 On April 19, 2017, 2017 June 6, 2014, “2017 June 15, 2017), 2017 2020 2017 $5.0 2020 2020 ninety 90 September 30, 2017. June 20, 2017, 2017 2017 $4.0 The 2020 March 15, 2020 first 2020 12% 2% March 31, June 30, September 30, December 31 2020 2020 2020 2020 2020 may 2020 2020 The 2020 2020 $14.72 0.0679 $1 2020 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, the Company may one 3 2020 2022 The following table sets forth information pertaining to the 2022 Principal Amount of 2022 Notes Total Balance - December 31, 2017 $ 515 $ 515 Exchange of 2022 Notes (515 ) (515 ) Balance - December 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, December 31, 2018, 2017 2016, ● $0.0 $0.2 $4.0 ● $.02 $1.2 $2.5 ● $0.0 $0.05 $1.2 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 amortizes debt discounts and debt issue costs associated with the 2022 40% July 1, 2017, five 2022 In the first 2018, 39,016 $515,000 2022

Note 10 - Equity Incentive Plan

Note 10 - Equity Incentive Plans	12 Months Ended
	Dec. 31, 2018
Notes to Financial Statements
Stock Incentive Plans Disclosure [Text Block]	10. 2006 2006, 2006 “2006 2006 2010 “2010 no 2006 December 31, 2018, no 2006 2010 2010 February 2011, 2010 June 2013, July 2015, June 2016, November 2016 May 2018, 2010 ten December 31, 2018, 290,300 2010 2,630 Employee Stock Purchase Plan February 2011, January 1 June 30 July 1 December 31 190 190 December 31, 2018 85% first no 2018.

Note 11 - Stock-Based Compensat

Note 11 - Stock-Based Compensation	12 Months Ended
	Dec. 31, 2018
Notes to Financial Statements
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]	11. Stock-Based Compensation Expense Year Ended December 31, 201 8 201 7 201 6 Stock options and ESPP awards Research and development $ 21 $ 37 $ 62 Selling, general and administrative 48 122 321 Restricted stock awards Research and development - 12 116 Selling, general and administrative - 17 143 Restricted stock units Research and development 85 70 28 Selling, general and administrative 417 163 216 Stock appreciation rights Research and Development 61 - - Selling, general and adminstrative 51 - - Total stock-based compensation $ 683 $ 421 $ 886 Determining Fair Value of Share-Based Payment Awards The following table sets forth the Black-Scholes option pricing model assumptions and resulting grant date fair value for stock options granted. There were no December 31, 2018. Year Ended December 31, 201 8 201 7 201 6 Risk-free interest rate – 2.01 % 1.49 % Expected dividend yield – None None Expected volatility factor – 119.00 % 106.70 % Expected option life (in years) – 5.77 5.77 Weighted average grant date fair value $ – $ 0.86 $ 5.66 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, 2018 December 31, 2018 Weighted- Average Weighted- Remaining Average Contractual Number of Exercise Term Aggregate Options Price (years) Intrinsic Value Options outstanding at December 31, 2017 2,346 $ 2,103.20 $ - Granted – – Canceled or forfeited (33 ) 876 Exercised - - Options outstanding at December 31, 2018 2,313 $ 2,358.44 6.87 $ - Options exercisable at December 31, 2018 1,922 $ 2,545.98 6.61 $ - Options vested and expected to vest at December 31, 2018 2,313 $ 2,358.44 6.87 $ - The aggregate intrinsic values in the table above represent the total pre-tax intrinsic values (the difference between the closing price of Gevo’s common stock on the last trading day of the 2018 December 31, 2018. December 31, 2018, 2017, 2016 The following table summarizes information associated with outstanding and exercisable stock options at December 31, 2018. Options Outstanding Options Exercisable Weighted- Weighted- Weighted- Average Weighted- Average Range of Average Remaining Average Remaining Exercise Number of Exercise Contractual Life Number of Exercise Contractual Life Prices Options Price in Years Options Price in Years $0.00 to $11,484 2,246 $ 475 7.06 1,855 $ 569 6.82 $11,485 to $22,968 18 $ 17,869 1.14 18 $ 17,869 1.14 $45,936 to $57,420 13 $ 56,460 0.21 13 $ 56,460 0.21 $57,421 to $68,904 18 $ 60,457 0.18 18 $ 60,457 0.18 $68,905 to $80,348 7 76,020 1.66 7 76,020 1.66 $91,872 to $103,356 8 $ 98,442 0.91 8 $ 98,442 0.91 $103,357 to $114,840 3 $ 106,001 <.01 3 $ 106,001 <.01 2.313 $ 2,097 6.88 1,922 $ 2,517.03 6.61 As of December 31, 2018, $0.01 one There is a maximum contractual term of 10 No Restricted Stock may three six Non-vested restricted stock awards at December 31, 2018 December 31, 2018 Weighted- Average Number of Grant-Date Shares Fair Value Non-vested at December 31, 2017 155 $ 876.00 Granted 290,300 3.45 Vested (155 ) 876.00 Canceled or forfeited - - Non-vested at December 31, 2018 290,300 $ 3.45 The total fair value of restricted stock that vested during the years ended December 31, 2018, 2017 2016, $0.5 $0.2 $0.3 December 31, 2018, $0.6 seven Stock Appreciation Rights. 132,559 $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 and at December 31, 2018. no December 31, 2017 2016. 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 grant date fair 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, 2018
Notes to Financial Statements
Income Tax Disclosure [Text Block]	12. There is no December 31, 2018, $378.3 $355.3 may $3.5 December 31, 2018. 2038 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 8 201 7 Deferred tax assets, net: Net operating loss carryforwards $ 103,612 $ 100,631 Research and other credits 3,482 3,482 Other temporary differences 3,760 3,266 Deferred tax assets - before valuation allowance 110,854 107,379 Valuation allowance (110,854 ) (107,379 ) Net deferred tax assets - after valuation allowance $ – $ – The Company recognizes uncertain tax positions net, against any operating losses or applicable research credits as they arise. Currently, there are no December 31, 2018. December 31, 2018 2017, not not The following table sets forth reconciling items from income tax computed at the statutory federal rate. Year Ended December 31, 201 8 201 7 201 6 Federal income tax at statutory rate 21.0 % 35.0 % 35.0 % State income taxes, net of federal benefits 6.2 % 7.5 % 2.9 % Research and other credits 0.0 % 0.0 % (5.8 %) Impact of change in statutory tax rates (8.8 %) (183.8 %) 0.0 % Permanent deductions (3.7 %) 7.5 % (18.0 %) Valuation allowance (14.7 %) 133.8 % (14.1 %) Effective tax rate 0.0 % 0.0 % (0.0 %) 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, 2018, December 31, 2018. The Company may no In December 2017, December 31, 2018, not

Note 13 - Employee Benefit Plan

Note 13 - Employee Benefit Plan	12 Months Ended
	Dec. 31, 2018
Notes to Financial Statements
Employee Benefit Plan [Text Block]	13. The Company’s employees participate in the Gevo, Inc. 401 “401 401 three 401 may not may 401 January 2013,

Note 14 - Commitments and Conti

Note 14 - Commitments and Contingencies	12 Months Ended
	Dec. 31, 2018
Notes to Financial Statements
Commitments and Contingencies Disclosure [Text Block]	14. Legal Matters. may not Leases . The Company has no December 31, 2018 2017, The Company has an operating lease for its office, research, and production facility in Englewood, Colorado (the “Colorado Facility”) with a term expiring in July 2021. 12 July 2019 July 2020. Rent expense for the years ended December 31, 2018, 2017 2016 $1.7 $1.6 $1.7 The table below shows the future minimum payments under non-cancelable operating leases at December 31, 2018 ( Operating Leases 2019 $ 1,414 2020 655 2021 218 2022 - 2023 - Thereafter - Total $ 2,287 Indemnifications may December 31, 2018 2017, 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, 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, 2018.

Note 15 - Fair Value Measuremen

Note 15 - Fair Value Measurements and Fair Value of Financial Instruments	12 Months Ended
	Dec. 31, 2018
Notes to Financial Statements
Fair Value Disclosures [Text Block]	15. 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, excluding cash and cash equivalents, accounts receivable and accounts payable; as carrying value approximately fair value due to their short-term nature; at December 31, 2018 2017, Fair Value Measurements at December 31, 2018 (In thousands) Fair Value at December 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 $ 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 $ - $ 1,047 $ 29 $ 1,018 $ - 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 $ - $ 1,916 $ 189 $ 1,727 $ - Fair Value Measurements Using Significant Unobservable Inputs (Level 3) (in thousands) Derivative Warrant Liability 2020 Embedded Derivative Liability 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 2,976 (2,637 ) Included in other comprehensive income – – Purchases, issues, sales and settlements Purchases – – Issues – – Sales – – Settlements (4,905 ) (2,193 ) Closing balance $ 22 $ 394 Fair Value Methodology Inventories. 1 2 2020 2020 $13.5 June 20, 2017, 2017 2020 2020 $12.6 December 31, 2018. 2020 $0.4 December 31, 2018 3 7, 2020 Derivative Warrant Liability 2017, 3 2 first 2017, 3 3 $0.02 December 31, 2018. 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, 2018
Notes to Financial Statements
Segment Reporting Disclosure [Text Block]	16. 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 8 201 7 201 6 Revenues from external customers: Gevo $ 1,222 $ 1,097 $ 2,425 Gevo Development / Agri-Energy 31,641 26,439 24,788 Consolidated $ 32,863 $ 27,536 $ 27,213 Loss from operations: Gevo $ (11,552 ) $ (10,603 ) $ (11,045 ) Gevo Development / Agri-Energy (10,649 ) (12,679 ) (12,940 ) Consolidated $ (22,201 ) $ (23,282 ) $ (23,985 ) Interest expense: Gevo $ 3,237 $ 2,951 $ 7,789 Gevo Development / Agri-Energy - - 48 Consolidated $ 3,237 $ 2,951 $ 7,837 Depreciation and amortization expense: Gevo $ 269 $ 473 $ 738 Gevo Development / Agri-Energy 6,251 6,168 6,009 Consolidated $ 6,520 $ 6,641 $ 6,747 Acquisitions of plant, property and equipment: Gevo $ 27 $ 120 $ 350 Gevo Development / Agri-Energy 3,096 1,786 5,588 Consolidated $ 3,123 $ 1,906 $ 5,938 December 31, 201 8 2017 Total assets: Gevo $ 105,379 $ 87,507 Gevo Development / Agri-Energy 140,982 149,758 Intercompany eliminations (1) (139,326 ) (148,412 ) Consolidated (2) $ 107,035 $ 88,853 ( 1 Includes intercompany sales of $0.1 $0.4 ( 2 All other significant non-cash items relate to the activities of Gevo.

Note 17 - Subsequent Events

Note 17 - Subsequent Events	12 Months Ended
	Dec. 31, 2018
Notes to Financial Statements
Subsequent Events [Text Block]	17. None 1 December 31, 2018. HCS Group GmbH February 2019,

Significant Accounting Policies

Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
Nature of Business [Policy Text Block]	Nature of Business In addition to its ethanol production capabilities, 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. 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 production facility located in Luverne, Minnesota (the "Luverne Facility") has production capacity of about 20 45 50 3 As of December 31, 2018,
Financial Condition [Policy Text Block]	Financial Condition December 31, 2018 2017, $28.0 $24.6 $429.3 December 31, 2018. December 31, 2018 $33.7 (iv) exploration of strategic alternatives and new financings; 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
At-the-market Offering Program, Policy [Policy Text Block]	At-the-Market Offering Program. February 2018, 2018 $84.9 December 31, 2018, $44.6 During the year ended December 31, 2018, 6,936,930 $40.3 $0.9 $0.5 December 31, 2018. three December 31, 2018, 545,313 $2.5 $0.1 $0.1 The Company issued and sold 3,244,941 $9.9 December 31, 2018.
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, 2018.
Use of Estimates, Policy [Policy Text Block]	Use of Estimates
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
Receivables, Policy [Policy Text Block]	Accounts Receivable . The Company records receivables for products shipped and services provided but for which payment has not December 31, 201 8 and 201 7 , no December 31, 201 8 , one comprised 66% of the Company's outstanding trade accounts receivable. As of December 31, 2017 , one C&N Ethanol Marketing, LLC ("C&N Ethanol"), comprised 78 % of the Company's outstanding trade accounts receivable.
Inventory, Policy [Policy Text Block]	Inventories 2015 11
Derivatives, Policy [Policy Text Block]	Derivative Instruments 7 8 Consolidated Statement of Operations Consolidated Statement of Operation. As of December 31, 201 8 and 201 7 , the Company did not outside those probable of being used by the Company over a reasonable period in the normal course of business.
Property, Plant and Equipment, Policy [Policy Text Block]	Property, Plant and Equipment
Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block]	Impairment of Property, Plant and Equipment may not not not The Company evaluated its Luverne Facility for impairment as of December 31, 2018 2017. • sales price of isobutanol, hydrocarbons, ethanol and by-products such as dried distiller’s 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, 2018 2017, not may may
Debt, Policy [Policy Text Block]	Debt Issue Costs
Revenue Recognition, Policy [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 were deducted from the gross sales price at the time payment was remitted. Ethanol and related products sales were recorded net of commissions and shipping and handling costs. 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 the lease agreements are recognized on a straight-line basis over the term of the contract. For the year ended December 31, 2018, accounted for approximately 72 % of the Company's consolidated revenue. For the years ended December 31, 2017 and 2016, 76 % and 71% 21%, 17% 17% see Note 18 ). Given the production capacity compared to the overall size of the North American market and the fungible demand for the Company's products, the Company does not
Cost of Sales, Policy [Policy Text Block]	Cost of Goods Sold
Goodwill and Intangible Assets, Intangible Assets, Policy [Policy Text Block]	Patents December 31, 2018, 2017 2016 $0.2 $0.3 $0.2
Research and Development Expense, Policy [Policy Text Block]	Research and Development third
Income Tax, Policy [Policy Text Block]	Income Taxes not not December 31, 2018 2017, $110.9 $107.4
Share-based Compensation [Policy Text Block]	Stock-Based Compensation four
Earnings Per Share, Policy [Policy Text Block]	Net Loss Per Share December 31, 2018, 2017, 2016 The following table sets forth securities that could potentially dilute the calculation of diluted earnings per share. This table excludes any shares that could potentially be issued in settlement of make-whole payments associated with the 2020 2022 Year Ended December 31, 201 8 201 7 201 6 Warrants to purchase common stock - liability classified 55,963 359,619 55,119 Warrants to purchase common stock - equity classified 6 70 70 Convertible 2017 Notes – – 3,756 Convertible 2020 Notes 1,071,674 1,437,984 – Convertible 2022 Notes – – 280 Outstanding options to purchase common stock 813 2,322 846 Unvested restricted common stock 290,300 155 441 Stock appreciation rights 132,559 – – Total 1,551,315 1,800,150 60,512
New Accounting Pronouncements, Policy [Policy Text Block]	Recent Accounting Pronouncements Leases (“ASU 2016 02” . In February 2016, No. 2016 - 02, 842 . ASU 2016 02 2016 02 is effective for fiscal years beginning after December 15, 2018, December 31, 2018 $2.2 2016 02 January 1, 2019 While the Company has not 2016 02 $1 $1.5 not 12 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, 2017. April 2016, ASU No. 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 initial assessment on how this standard will impact the aforementioned sources of revenue. Ethanol sales and related products revenues, net. no 100 December 31, 2018, 2017 2016 72%, 76% 71% December 31, 2018, 2017 2016, no December 31, 2018, 2017 2016. no Hydrocarbon revenue. no no 2014 09 January 1, 2018. Grant and other revenues. Northwest Advanced Renewables Alliance 2014. not 606 Revenues from Contracts with Customers” 2014 09. 606, no 2014 09. Statement of Cash Flows – Restricted Cash (“ASU 2016 18” November 2016, No. 2016 18, Statement of Cash Flows Restricted Cash December 15, 2017. $2.6 2017 2020 June 2017 9 not April 2017 2017 no

Note 2 - Summary of Significa_2

Note 2 - Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2018
Notes Tables
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]	Year Ended December 31, 201 8 201 7 201 6 Warrants to purchase common stock - liability classified 55,963 359,619 55,119 Warrants to purchase common stock - equity classified 6 70 70 Convertible 2017 Notes – – 3,756 Convertible 2020 Notes 1,071,674 1,437,984 – Convertible 2022 Notes – – 280 Outstanding options to purchase common stock 2,311 2,322 846 Unvested restricted common stock 290,300 155 441 Stock appreciation rights 132,559 – – Total 1,552,813 1,800,150 60,512

Note 3 - Revenues From Contra_2

Note 3 - Revenues From Contracts With Customers Other Revenues (Tables)	12 Months Ended
	Dec. 31, 2018
Notes Tables
Disaggregation of Revenue [Table Text Block]	Year Ended December 31, 2018 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 Operating Segment Gevo $ 1,222 $ - $ 1,222 Gevo Development / Agri-Energy 31,641 - 31,641 $ 32,863 $ - $ 32,863 Geographic Region United States $ 31,688 $ - $ 31,688 Other 1,176 - 1,176 $ 32,863 $ - $ 32,863 Year Ended December 31, 2017 Major Goods/Service Line Revenues from Contracts with Customers Other Revenues Total Ethanol sales and related products, net $ 26,279 $ - $ 26,279 Hydrocarbon revenue 1,029 - 1,029 Grant and other revenue - 228 228 $ 27,308 $ 228 $ 27,536 Timing of Revenue Recognition Goods transferred at a point in time $ 27,308 $ - $ 27,308 Services transferred over time - 228 228 $ 27,308 $ 228 $ 27,536 Operating Segment Gevo $ 1,029 $ 68 $ 1,097 Gevo Development / Agri-Energy 26,279 160 26,439 $ 27,308 $ 228 $ 27,536 Geographic Region United States $ 26,324 $ 228 $ 26,552 Other 984 - 984 $ 27,308 $ 228 $ 27,536 Year Ended December 31, 2016 Major Goods/Service Line Revenues from Contracts with Customers Other Revenues Total Ethanol sales and related products, net $ 24,613 $ - $ 24,613 Hydrocarbon revenue 1,929 - 1,929 Grant and other revenue - 671 671 $ 26,542 $ 671 $ 27,213 Timing of Revenue Recognition Goods transferred at a point in time $ 26,542 $ - $ 26,542 Services transferred over time - 671 671 $ 26,542 $ 671 $ 27,213 Operating Segment Gevo $ 1,929 $ 496 $ 2,425 Gevo Development / Agri-Energy 24,613 175 24,788 $ 26,542 $ 671 $ 27,213 Geographic Region United States $ 24,654 $ 671 $ 25,325 Other 1,889 - 1,889 $ 26,542 $ 671 $ 27,213

Note 4 - Inventories (Tables)

Note 4 - Inventories (Tables)	12 Months Ended
	Dec. 31, 2018
Notes Tables
Schedule of Inventory, Current [Table Text Block]	December 31, 201 8 201 7 Raw materials Corn $ 29 $ 189 Enzymes and other inputs 204 202 Nutrients - 5 Finished goods Ethanol 182 222 Isobutanol 549 1,122 Jet Fuels, Isooctane and Isooctene 394 524 Distiller's grains 54 59 Work in process - Agri Energy 214 197 Work in process - Gevo 89 437 Spare parts 1,451 1,405 Total inventories $ 3,166 $ 4,362

Note 5 - Property, Plant and _2

Note 5 - Property, Plant and Equipment (Tables)	12 Months Ended
	Dec. 31, 2018
Notes Tables
Property, Plant and Equipment [Table Text Block]	December 31, (in years) 201 8 201 7 Construction in progress – $ 3,478 $ 479 Plant machinery and equipment 10 16,285 16,284 Site improvements 10 7,055 7,051 Agri-Energy Retrofit asset 20 70,842 70,842 Lab equipment, furniture and fixtures and vehicles 5 6,574 6,513 Demonstration plant 2 3,597 3,597 Buildings 10 2,543 2,543 Computer, office equipment and software 3 1,848 1,795 Leasehold improvements, pilot plant, land and support equipment 2 — 5 2,542 2,536 Total property, plant and equipment 114,764 111,640 Less accumulated depreciation and amortization (47,728 ) (41,271 ) Property, plant and equipment, net $ 67,036 $ 70,369

Note 6 - Accounts Payable and_2

Note 6 - Accounts Payable and Accrued Liabilities (Tables)	12 Months Ended
	Dec. 31, 2018
Notes Tables
Schedule of Accounts Payable and Accrued Liabilities [Table Text Block]	December 31, 201 8 201 7 Accounts payable - trade $ 1,944 $ 666 Accrued legal-related fees 206 274 Accrued employee compensation 1,648 700 Accrued interest - 434 Accrued production fees 255 447 Accrued utilities payable 344 677 Accrued taxes payable 101 172 Customer deposit - 436 Other accrued liabilities * 376 205 Total accounts payable and accrued liabilities $ 4,874 $ 4,011

Note 7 - Embedded Derivatives (

Note 7 - Embedded Derivatives (Tables)	12 Months Ended
	Dec. 31, 2018
Notes Tables
Schedule of Assumptions Used [Table Text Block]	December 31, December 31,, 2018 2017 Stock price $ 1.96 $ 11.80 Conversion Rate 67.95 1,358.90 Conversion Price $ 14.72 $ 14.72 Maturity date March 15, 2020 March 15, 2020 Risk-free interest rate 2.57 % 1.89 % Estimated stock volatility 150 % 75 % Estimated credit spread 31 % 28 %

Note 8 - Derivative Warrant L_2

Note 8 - Derivative Warrant Liability (Tables)	12 Months Ended
	Dec. 31, 2018
Notes Tables
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]	Issuance Date Expiration Date Exercise Price as of December 31, 2018 Shares Underlying Warrants on Issuance Date Shares Issued upon Warrant Exercises as of December 31, 2018 Shares Underlying Warrants Outstanding as of December 31, 2018 2014 Warrants 08/05/2014 08/05/2019 $ 65.50 2,500 1,526 974 Series A Warrants 02/03/2015 02/03/2020 $ 3.80 5,542 5,222 320 Series C Warrants 05/19/2015 05/19/2020 $ 53.43 1,075 – 1,075 Series D Warrants 12/11/2015 12/11/2020 $ 40.00 25,125 25,078 47 Series F Warrants 04/01/2016 04/01/2021 $ 40.00 25,733 11,692 14,041 Series I Warrants 09/13/2016 09/13/2021 $ 220.00 35,650 – 35,650 Series K Warrants 02/17/2017 2/17/2022 $ 3.80 312,516 308,660 3,856 408,141 352,178 55,963
Schedule of Warrant Exercises [Table Text Block]	Twelve Months Ended December 31, 201 8 Common Stock Issued Proceeds Series A Warrants 251 1,054 Series K Warrants 300,660 1,262,712 300,911 $ 1,263,766

Note 9 - Debt (Tables)

Note 9 - Debt (Tables)	12 Months Ended
	Dec. 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 - 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 Principal Amount of 2022 Notes Total Balance - December 31, 2017 $ 515 $ 515 Exchange of 2022 Notes (515 ) (515 ) Balance - December 31, 2018 $ - $ -

Note 11 - Stock-Based Compens_2

Note 11 - Stock-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2018
Notes Tables
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block]	Year Ended December 31, 201 8 201 7 201 6 Stock options and ESPP awards Research and development $ 21 $ 37 $ 62 Selling, general and administrative 48 122 321 Restricted stock awards Research and development - 12 116 Selling, general and administrative - 17 143 Restricted stock units Research and development 85 70 28 Selling, general and administrative 417 163 216 Stock appreciation rights Research and Development 61 - - Selling, general and adminstrative 51 - - Total stock-based compensation $ 683 $ 421 $ 886
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]	Year Ended December 31, 201 8 201 7 201 6 Risk-free interest rate – 2.01 % 1.49 % Expected dividend yield – None None Expected volatility factor – 119.00 % 106.70 % Expected option life (in years) – 5.77 5.77 Weighted average grant date fair value $ – $ 0.86 $ 5.66 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 grant date fair value $ 1.65 $ 4.53
Share-based Compensation, Stock Options, Activity [Table Text Block]	Weighted- Average Weighted- Remaining Average Contractual Number of Exercise Term Aggregate Options Price (years) Intrinsic Value Options outstanding at December 31, 2017 2,346 $ 2,103.20 $ - Granted – – Canceled or forfeited (33 ) 876 Exercised - - Options outstanding at December 31, 2018 2,313 $ 2,358.44 6.87 $ - Options exercisable at December 31, 2018 1,922 $ 2,545.98 6.61 $ - Options vested and expected to vest at December 31, 2018 2,313 $ 2,358.44 6.87 $ -
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]	Options Outstanding Options Exercisable Weighted- Weighted- Weighted- Average Weighted- Average Range of Average Remaining Average Remaining Exercise Number of Exercise Contractual Life Number of Exercise Contractual Life Prices Options Price in Years Options Price in Years $0.00 to $11,484 2,246 $ 475 7.06 1,855 $ 569 6.82 $11,485 to $22,968 18 $ 17,869 1.14 18 $ 17,869 1.14 $45,936 to $57,420 13 $ 56,460 0.21 13 $ 56,460 0.21 $57,421 to $68,904 18 $ 60,457 0.18 18 $ 60,457 0.18 $68,905 to $80,348 7 76,020 1.66 7 76,020 1.66 $91,872 to $103,356 8 $ 98,442 0.91 8 $ 98,442 0.91 $103,357 to $114,840 3 $ 106,001 <.01 3 $ 106,001 <.01 2.313 $ 2,097 6.88 1,922 $ 2,517.03 6.61
Schedule of Nonvested Share Activity [Table Text Block]	Weighted- Average Number of Grant-Date Shares Fair Value Non-vested at December 31, 2017 155 $ 876.00 Granted 290,300 3.45 Vested (155 ) 876.00 Canceled or forfeited - - Non-vested at December 31, 2018 290,300 $ 3.45

Note 12 - Income Taxes (Tables)

Note 12 - Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2018
Notes Tables
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]	December 31, 201 8 201 7 Deferred tax assets, net: Net operating loss carryforwards $ 103,612 $ 100,631 Research and other credits 3,482 3,482 Other temporary differences 3,760 3,266 Deferred tax assets - before valuation allowance 110,854 107,379 Valuation allowance (110,854 ) (107,379 ) Net deferred tax assets - after valuation allowance $ – $ –
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]	Year Ended December 31, 201 8 201 7 201 6 Federal income tax at statutory rate 21.0 % 35.0 % 35.0 % State income taxes, net of federal benefits 6.2 % 7.5 % 2.9 % Research and other credits 0.0 % 0.0 % (5.8 %) Impact of change in statutory tax rates (8.8 %) (183.8 %) 0.0 % Permanent deductions (3.7 %) 7.5 % (18.0 %) Valuation allowance (14.7 %) 133.8 % (14.1 %) Effective tax rate 0.0 % 0.0 % (0.0 %)

Note 14 - Commitments and Con_2

Note 14 - Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2018
Notes Tables
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]	Operating Leases 2019 $ 1,414 2020 655 2021 218 2022 - 2023 - Thereafter - Total $ 2,287

Note 15 - Fair Value Measurem_2

Note 15 - Fair Value Measurements and Fair Value of Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2018
Notes Tables
Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]	Fair Value Measurements at December 31, 2018 (In thousands) Fair Value at December 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 $ 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 $ - $ 1,047 $ 29 $ 1,018 $ - 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 $ - $ 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 Embedded Derivative Liability 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 2,976 (2,637 ) Included in other comprehensive income – – Purchases, issues, sales and settlements Purchases – – Issues – – Sales – – Settlements (4,905 ) (2,193 ) Closing balance $ 22 $ 394

Note 16 - Segments (Tables)

Note 16 - Segments (Tables)	12 Months Ended
	Dec. 31, 2018
Notes Tables
Schedule of Segment Reporting Information, by Segment [Table Text Block]	Year Ended December 31, 201 8 201 7 201 6 Revenues from external customers: Gevo $ 1,222 $ 1,097 $ 2,425 Gevo Development / Agri-Energy 31,641 26,439 24,788 Consolidated $ 32,863 $ 27,536 $ 27,213 Loss from operations: Gevo $ (11,552 ) $ (10,603 ) $ (11,045 ) Gevo Development / Agri-Energy (10,649 ) (12,679 ) (12,940 ) Consolidated $ (22,201 ) $ (23,282 ) $ (23,985 ) Interest expense: Gevo $ 3,237 $ 2,951 $ 7,789 Gevo Development / Agri-Energy - - 48 Consolidated $ 3,237 $ 2,951 $ 7,837 Depreciation and amortization expense: Gevo $ 269 $ 473 $ 738 Gevo Development / Agri-Energy 6,251 6,168 6,009 Consolidated $ 6,520 $ 6,641 $ 6,747 Acquisitions of plant, property and equipment: Gevo $ 27 $ 120 $ 350 Gevo Development / Agri-Energy 3,096 1,786 5,588 Consolidated $ 3,123 $ 1,906 $ 5,938 December 31, 201 8 2017 Total assets: Gevo $ 105,379 $ 87,507 Gevo Development / Agri-Energy 140,982 149,758 Intercompany eliminations (1) (139,326 ) (148,412 ) Consolidated (2) $ 107,035 $ 88,853

Note 1 - Nature of Business a_2

Note 1 - Nature of Business and Financial Condition (Details Textual) $ in Thousands	Jun. 01, 2018	Mar. 26, 2019USD ($)shares	Dec. 31, 2018USD ($)shares	Dec. 31, 2018USD ($)shares	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Net Income (Loss) Attributable to Parent, Total				$ (27,976)	$ (24,630)	$ (37,228)
Retained Earnings (Accumulated Deficit), Ending Balance			$ (429,326)	(429,326)	(401,350)
Cash and Cash Equivalents, at Carrying Value, Ending Balance			$ 33,734	33,734	11,553
Proceeds from Issuance of Common Stock				39,394	$ 11,044	$ 28,661
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				$ 84,900
Offering of Stock, Remaining Capacity, Shares | shares			44,600,000	44,600,000
Stock Issued During Period, Shares, New Issues | shares			545,313	6,936,930
Payments of Stock Issuance Costs				$ 40,300
Proceeds from Issuance of Common Stock			$ 2,500
At-the-market Offering [Member] | Subsequent Event [Member]
Stock Issued During Period, Shares, New Issues | shares		3,244,941
Proceeds from Issuance of Common Stock		$ 9,900
At-the-market Offering [Member] | Other Offering Related Expenses [Member]
Payments of Stock Issuance Costs			100	500
At-the-market Offering [Member] | Sales Agent [Member]
Payments of Stock Issuance Costs			$ 100	$ 900

Note 2 - Summary of Significa_3

Note 2 - Summary of Significant Accounting Policies (Details Textual)	12 Months Ended
	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Jan. 01, 2019USD ($)
Allowance for Doubtful Accounts Receivable, Ending Balance	$ 7	$ 0
Selling, General and Administrative Expense, Total	8,122,000	7,471,000	$ 8,965,000
Deferred Tax Assets, Valuation Allowance, Total	$ 110,854,000	$ 107,379,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	4 years
Operating Leases, Future Minimum Payments Due, Total	$ 2,287,000
Percentage of Product Revenue	100.00%	100.00%	100.00%
Percentage of Product Revenue Out of Total Revenues	72.00%	76.00%	71.00%
Notes 2017 [Member] | New Accounting Pronouncement, Early Adoption, Effect [Member]
Increase (Decrease) in Restricted Cash, Total		$ 2,600,000
Accounting Standards Update 2016-02 [Member] | Minimum [Member] | Scenario, Forecast [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption				$ 1,000,000
Accounting Standards Update 2016-02 [Member] | Maximum [Member] | Scenario, Forecast [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption				$ 1,500,000
Patent-Related Legal Expenses [Member]
Selling, General and Administrative Expense, Total	$ 200,000	$ 300,000	$ 200,000
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Eco-Energy, LLC [Member]
Number of Customer	1
Concentration Risk, Percentage	66.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | C&N Ethanol Marketing, LLC [Member]
Number of Customer		1
Concentration Risk, Percentage		78.00%
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Eco-Energy, LLC [Member]
Concentration Risk, Percentage	72.00%
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | C&N Ethanol Marketing, LLC [Member]
Concentration Risk, Percentage		76.00%	71.00%
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Purina Animal Nutrition, LLC [Member]
Concentration Risk, Percentage	21.00%	17.00%	17.00%

Note 2 - Summary of Significa_4

Note 2 - Summary of Significant Accounting Policies - Securities that Potentially Dilute Calculation of Diluted Earnings Per Share (Details) - shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Antidilutive securities (in shares)	1,552,813	1,800,150	60,512
Warrants to Purchase Common Stock - Liability Classified [Member]
Antidilutive securities (in shares)	55,963	359,619	55,119
Warrants to Purchase Common Stock - Equity Classified [Member]
Antidilutive securities (in shares)	6	70	70
Convertible 2017 Notes [Member]
Antidilutive securities (in shares)			3,756
Convertible 2020 Notes [Member]
Antidilutive securities (in shares)	1,071,674	1,437,984
Convertible 2022 Notes [Member]
Antidilutive securities (in shares)			280
Employee Stock Option [Member]
Antidilutive securities (in shares)	2,311	2,322	846
Restricted Stock [Member]
Antidilutive securities (in shares)	290,300	155	441
Stock Appreciation Rights (SARs) [Member]
Antidilutive securities (in shares)	132,559

Note 3 - Revenues From Contra_3

Note 3 - Revenues From Contracts With Customers Other Revenues (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenue from Contract with Customer, Including Assessed Tax	$ 32,863	$ 27,308	$ 26,542
Contract with Customer, Asset, Net, Total	0	0	0
Contract with Customer, Liability, Total	0	0	0
Contract with Customer, Asset, Credit Loss Expense	0	0	0
Transferred at Point in Time [Member]
Revenue from Contract with Customer, Including Assessed Tax	32,838	27,308	26,542
Transferred at Point in Time [Member] | Variable Consideration or Multiple Performance Obligations [Member]
Revenue from Contract with Customer, Including Assessed Tax	0	0	0
Revenue, Remaining Performance Obligation, Amount	0	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	0
Revenue, Remaining Performance Obligation, Amount	$ 0	$ 0	$ 0

Note 3 - Revenues From Contra_4

Note 3 - Revenues From Contracts With Customers Other Revenues - Disaggregated Revenues (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenue	$ 32,863	$ 27,308	$ 26,542
Other revenues		228	671
Total revenues	32,863	27,536	27,213
UNITED STATES
Revenue	31,688	26,324	24,654
Other revenues		228	671
Total revenues	31,688	26,552	25,325
All Other Countries [Member]
Revenue	1,176	984	1,889
Other revenues
Total revenues	1,176	984	1,889
Gevo [Member]
Revenue	1,222	1,029	1,929
Other revenues		68	496
Total revenues	1,222	1,097	2,425
Gevo Development / Agri-Energy [Member]
Revenue	31,641	26,279	24,613
Other revenues		160	175
Total revenues	31,641	26,439	24,788
Transferred at Point in Time [Member]
Revenue	32,838	27,308	26,542
Other revenues
Total revenues	32,838	27,308	26,542
Transferred over Time [Member]
Revenue	25
Other revenues		228	671
Total revenues	25	228	671
Ethanol Sales and Related Products [Member]
Revenue	31,641	26,279	24,613
Other revenues
Total revenues	31,641	26,279	24,613
Hydrocarbon [Member]
Revenue	1,197	1,029	1,929
Other revenues
Total revenues	1,197	1,029	1,929
Grant and Other [Member]
Revenue	25
Other revenues		228	671
Total revenues	$ 25	$ 228	$ 671

Note 4 - Inventories - Componen

Note 4 - Inventories - Components of Inventory Balances (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Finished goods:
Spare parts	$ 1,451	$ 1,405
Total inventories	3,166	4,362
Corn [Member]
Raw materials:
Raw materials	29	189
Enzymes and Other Inputs [Member]
Raw materials:
Raw materials	204	202
Nutrients [Member]
Raw materials:
Raw materials		5
Ethanol [Member]
Finished goods:
Finished goods	182	222
Isobutanol [Member]
Finished goods:
Finished goods	549	1,122
Jet Fuels, Isooctane and Isooctene [Member]
Finished goods:
Finished goods	394	524
Distiller's Grains [Member]
Finished goods:
Finished goods	54	59
Agri-Energy [Member]
Finished goods:
Work in process	214	197
Gevo [Member]
Finished goods:
Work in process	$ 89	$ 437

Note 5 - Property, Plant and _3

Note 5 - Property, Plant and Equipment (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Capital Leased Assets, Gross, Total	$ 0	$ 0
Depreciation, Nonproduction	6,500	6,600	$ 6,700
Cost, Depreciation	$ 6,300	$ 6,200	$ 6,000

Note 5 - Property, Plant and _4

Note 5 - Property, Plant and Equipment - Property, Plant and Equipment by Classification (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Property, plant, and equipment, gross	$ 114,764	$ 111,640
Less accumulated depreciation and amortization	(47,728)	(41,271)
Property, plant and equipment, net	67,036	70,369
Construction in Progress [Member]
Property, plant, and equipment, gross	3,478	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	$ 7,055	7,051
Property, plant and equipment, useful life (Year)	10 years
Agri-Energy Retrofit Asset [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	$ 6,574	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	$ 1,848	1,795
Property, plant and equipment, useful life (Year)	3 years
Leasehold Improvements [Member]
Property, plant, and equipment, gross	$ 2,542	$ 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 - Accounts Payable and_3

Note 6 - Accounts Payable and Accrued Liabilities - Components Accounts Payable and Accrued Liabilities in Consolidated Balance Sheets (Details) - USD ($) $ in Thousands		Dec. 31, 2018	Dec. 31, 2017
Accounts payable - trade		$ 1,944	$ 666
Accrued legal-related fees		206	274
Accrued employee compensation		1,648	700
Accrued interest			434
Accrued production fees		255	447
Accrued utilities payable		344	677
Accrued taxes payable		101	172
Customer deposit			436
Other accrued liabilities *	[1]	376	205
Total accounts payable and accrued liabilities		$ 4,874	$ 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 7 - Embedded Derivatives_2

Note 7 - Embedded Derivatives (Details Textual)	1 Months Ended		12 Months Ended
	Jan. 31, 2018USD ($)shares	Jun. 30, 2017	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Jun. 20, 2017USD ($)	Apr. 19, 2017	Jul. 31, 2012
Embedded Derivative, Fair Value of Embedded Derivative, Net, Total			$ 400,000			$ 7,000,000
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net, Total			2,637,000	$ 1,751,000
Common Stock [Member]
Debt Conversion, Converted Instrument, Shares Issued | shares	39,016
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			400,000
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net, Total
Convertible 2022 Notes [Member]
Debt Instrument, Interest Rate, Stated Percentage								7.50%
Embedded Derivative, Fair Value of Embedded Derivative, Net, Total			$ 0
Debt Conversion, Original Debt, Amount	$ 515,000
Debt Conversion, Converted Instrument, Shares Issued | shares	39,016

Note 7 - Embedded Derivatives -

Note 7 - Embedded Derivatives - Schedule of Inputs to Lattice Model Used to Value Embedded Derivatives (Details)	12 Months Ended
	Dec. 31, 2018$ / sharesshares	Dec. 31, 2017$ / sharesshares
Stock price (in dollars per share)	$ 1.96	$ 11.80
Conversion Rate (in shares) | shares	67.95	1,358.9
Conversion Price (in dollars per share)	$ 14.72	$ 14.72
Maturity date	Mar. 15, 2020	Mar. 15, 2020
Measurement Input, Risk Free Interest Rate [Member]
Risk-free interest rate	0.0257	0.000189
Measurement Input, Price Volatility [Member]
Risk-free interest rate	1.5	0.0075
Measurement Input, Entity Credit Risk [Member]
Risk-free interest rate	0.31	0.0028

Note 8 - Derivative Warrant L_3

Note 8 - Derivative Warrant Liability (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Class of Warrant or Right, Issued During Period	6
Class of Warrant or Right, Issued During Period, Exercise Price	$ 345
Warrants and Rights Outstanding	$ 22	$ 1,951

Note 8 - Derivative Warrant L_4

Note 8 - Derivative Warrant Liability - Schedule of Shares Issued Upon Exercise of Warrants (Details) - $ / shares	12 Months Ended
	Dec. 31, 2018		Feb. 28, 2017	Feb. 17, 2017	Sep. 13, 2016	Apr. 01, 2016	Dec. 11, 2015	May 19, 2015	Feb. 03, 2015	Aug. 05, 2014
Shares underlying warrants (in shares)	55,963	[1]	408,141
Shares issues upon warrant exercises (in shares)	352,178
2014 Warrants [Member]
Warrant, issuance date	Aug. 5, 2014
Warrants, expiration date	Aug. 5, 2019
Warrant exercise price (in dollars per share)	$ 65.50
Shares underlying warrants (in shares)	974	[1]								2,500
Shares issues upon warrant exercises (in shares)	1,526
Series A Warrants [Member]
Warrant, issuance date	Feb. 3, 2015
Warrants, expiration date	Feb. 3, 2020
Warrant exercise price (in dollars per share)	$ 3.80
Shares underlying warrants (in shares)	320	[1]							5,542
Shares issues upon warrant exercises (in shares)	5,222
Series C Warrants [Member]
Warrant, issuance date	May 19, 2015
Warrants, expiration date	May 19, 2020
Warrant exercise price (in dollars per share)	$ 53.43
Shares underlying warrants (in shares)	1,075	[1]						1,075
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)	$ 40
Shares underlying warrants (in shares)	47	[1]					25,125
Shares issues upon warrant exercises (in shares)	25,078
Series F Warrants [Member]
Warrant, issuance date	Apr. 1, 2016
Warrants, expiration date	Apr. 1, 2021
Warrant exercise price (in dollars per share)	$ 40
Shares underlying warrants (in shares)	14,041	[1]				25,733
Shares issues upon warrant exercises (in shares)	11,692
Series I Warrants [Member]
Warrant, issuance date	Sep. 13, 2016
Warrants, expiration date	Sep. 13, 2021
Warrant exercise price (in dollars per share)	$ 220
Shares underlying warrants (in shares)	35,650	[1]			35,650
Shares issues upon warrant exercises (in shares)
Series K Warrants [Member]
Warrant, issuance date	Feb. 17, 2017
Warrants, expiration date	Feb. 17, 2022
Warrant exercise price (in dollars per share)	$ 3.80
Shares underlying warrants (in shares)	3,856	[1]		312,516
Shares issues upon warrant exercises (in shares)	308,660
[1]	This table does not include equity-classified warrants issued in 2011, to purchase 6 shares of common stock with a strike price of $345 per share.

Note 8 - Derivative Warrant L_5

Note 8 - Derivative Warrant Liability - Schedule of Common Stock on Warrants Exercised (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Issuance of common stock upon exercise of warrants (in shares)	300,911
Proceeds from the exercise of warrants	$ 1,263,766	$ 3,429,000	$ 12,298,000
Series A Warrants [Member]
Issuance of common stock upon exercise of warrants (in shares)	251
Proceeds from the exercise of warrants	$ 1,054
Series K Warrants [Member]
Issuance of common stock upon exercise of warrants (in shares)	300,660
Proceeds from the exercise of warrants	$ 1,262,712

Note 9 - Debt (Details Textual)

Note 9 - Debt (Details Textual) - USD ($)	Apr. 19, 2017	Jan. 31, 2018	Jul. 31, 2012	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jun. 30, 2017
Debt Instrument, Convertible, Conversion Price				$ 14.72	$ 14.72
Amortization of Debt Issuance Costs and Discounts, Total				$ 1,706,000	$ 962,000	$ 3,977,000
Interest Expense, Debt, Total				3,237,000	2,951,000	7,837,000
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	$ 14.72
Debt Instrument, Convertible, Conversion Ratio	0.0679
Beneficial Ownership Limitation, Percentage	4.99%
Beneficial Ownership Limitation Percentage, Notice	61 days
Beneficial Ownership Limitation After Notice, Percentage	9.99%
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	200,000	4,000,000
Expenses Related to Debt Conversion				20,000	1,200,000	2,500,000
Interest Expense, Debt, Total				$ 0	$ 50,000	$ 1,200,000
Debt Discounts and Debt Issue Costs Amortization Rate				40.00%
Debt Instrument, Convertible, Remaining Discount Amortization Period				5 years
Debt Conversion, Converted Instrument, Shares Issued		39,016
Debt Conversion, Original Debt, Amount		$ 515,000
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

Note 9 - Debt - Information Per

Note 9 - Debt - Information Pertaining to Convertible Notes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net, Total	$ 2,637	$ 1,751
Balance - December 31,2018	400
Embedded Derivative, 2020 Convertible Notes [Member]
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net, Total	(2,637)
Conversion of 2020 Notes into common stock	(2,193)
Balance - December 31, 2017	5,224
Balance - December 31,2018	394	5,224
Convertible 2020 Notes [Member]
Amortization of debt issue costs	309
Paid-in-kind interest	304
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net, Total
Amortization of debt discount	1,094
Conversion of 2020 Notes into common stock	(2,644)
Balance - December 31, 2017	13,491
Balance - December 31,2018	12,554	13,491
Balance - December 31,2018	400
Convertible 2020 Notes [Member] | Embedded Derivative, 2020 Convertible Notes [Member]
Amortization of debt issue costs	309
Paid-in-kind interest	304
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net, Total	(2,637)
Amortization of debt discount	1,094
Balance - December 31, 2017	18,715
Conversion of 2020 Notes into common stock	(4,837)
Balance - December 31,2018	12,948	18,715
Convertible 2020 Notes [Member] | Principal Amount of 2020 Notes [Member]
Balance - December 31, 2017	16,657
Paid-in-kind interest	304
Balance - December 31,2018	13,775	16,657
Conversion of 2020 Notes into common stock	(3,186)
Convertible 2020 Notes [Member] | Debt Issue Costs [Member]
Balance - December 31, 2017	(2,501)
Amortization of debt discount	1,094
Balance - December 31,2018	(979)	(2,501)
Conversion of 2020 Notes into common stock	428
Convertible 2020 Notes [Member] | Debt Discount [Member]
Amortization of debt issue costs	309
Conversion of 2020 Notes into common stock	114
Balance - December 31, 2017	(665)
Balance - December 31,2018	(242)	(665)
Convertible 2022 Notes [Member]
Balance - December 31,2018	0
Convertible 2022 Notes [Member] | Principal Amount of 2022 Notes [Member]
Balance - December 31, 2017	515
Balance - December 31,2018		$ 515
Exchange of 2022 Notes	$ (515)

Note 10 - Equity Incentive Pl_2

Note 10 - Equity Incentive Plans (Details Textual)	12 Months Ended
	Dec. 31, 2018shares
Omnibus Securities and Incentive Plan 2006 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	0
Stock Incentive Plan 2010 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	2,630
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	10 years
Common Stock, Capital Shares Reserved for Future Issuance	290,300
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, 2018	Dec. 31, 2017	Dec. 31, 2016
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, Options, Exercises in Period, Intrinsic Value	$ 0	$ 0	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	4 years
Employee Stock Option [Member]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total	$ 10
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	1 year
Deferred Compensation Arrangement with Individual, Maximum Contractual Term	10 years
Restricted Stock [Member]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total	$ 600
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	210 days
Share Based Compensation Arrangement by Share Based Payment Award Fair Value of Options Vested in Period	$ 500	$ 200	$ 300
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	290,300
Restricted Stock [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years
Restricted Stock [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	6 years
Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	132,559	0	0
Stock Granted, Value, Share-based Compensation, Net of Forfeitures, 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, 2018	Dec. 31, 2017	Dec. 31, 2016
Stock-based compensation	$ 683	$ 421	$ 886
Stock Options Issued to Employees and Board Members [Member] | Research and Development Expense [Member]
Stock-based compensation	21	37	62
Stock Options Issued to Employees and Board Members [Member] | Selling, General and Administrative Expenses [Member]
Stock-based compensation	48	122	321
Restricted Stock [Member] | Research and Development Expense [Member]
Stock-based compensation		12	116
Restricted Stock [Member] | Selling, General and Administrative Expenses [Member]
Stock-based compensation		17	143
Restricted Stock Units (RSUs) [Member] | Research and Development Expense [Member]
Stock-based compensation	85	70	28
Restricted Stock Units (RSUs) [Member] | Selling, General and Administrative Expenses [Member]
Stock-based compensation	417	163	216
Stock Appreciation Rights (SARs) [Member] | Research and Development Expense [Member]
Stock-based compensation	61
Stock Appreciation Rights (SARs) [Member] | Selling, General and Administrative Expenses [Member]
Stock-based compensation	$ 51

Note 11 - Stock-Based Compens_5

Note 11 - Stock-Based Compensation - Determining Fair Value of Share-Based Payment Awards (Details) - $ / shares	3 Months Ended		12 Months Ended
	Aug. 09, 2018	[1]	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Employee Stock Option [Member]
Risk-free interest rate				2.01%	1.49%
Expected dividend yield				0.00%	0.00%
Expected volatility factor				119.00%	106.70%
Expected option life (Year)				5 years 281 days	5 years 281 days
Weighted average grant date fair value (in dollars per share)				$ 0.86	$ 5.66
Stock Appreciation Rights (SARs) [Member]
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 grant date fair 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 11 - Stock-Based Compens_6

Note 11 - Stock-Based Compensation - Stock Option Award Activity (Details)	12 Months Ended
	Dec. 31, 2018$ / sharesshares
Options outstanding at December 31, 2017 (in shares) | shares	2,346
Options outstanding at December 31, 2017 (in dollars per share) | $ / shares	$ 2,103.20
Granted (in shares) | shares
Granted (in dollars per share) | $ / shares
Canceled or forfeited (in shares) | shares	(33)
Canceled or forfeited (in dollars per share) | $ / shares	$ 876
Exercised (in shares) | shares
Exercised (in dollars per share) | $ / shares
Options outstanding at December 31, 2018 (in shares) | shares	2,313
Options outstanding at December 31, 2018 (in dollars per share) | $ / shares	$ 2,358.44
Options Outstanding, Weighted- Average Remaining Contractual Life in Years (Year)	6 years 321 days
Options Exercisable, Number of Options (in shares) | shares	1,922
Options Exercisable, Weighted- Average Exercise Price (in dollars per share) | $ / shares	$ 2,517.03
Options Exercisable, Weighted- Average Remaining Contractual Life in Years (Year)	6 years 222 days
Options vested and expected to vest at December 31, 2018 (in shares) | shares	2,313
Options vested and expected to vest at December 31, 2018 (in dollars per share) | $ / shares	$ 2,358.44
Options vested and expected to vest at December 31, 2018 (Year)	6 years 317 days

Note 11 - Stock-Based Compens_7

Note 11 - Stock-Based Compensation - Outstanding and Exercisable Stock Options (Details) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Options Outstanding, Number of Options (in shares)	2,313	2,346
Options Outstanding, Weighted- Average Exercise Price (in dollars per share)	$ 2,358.44	$ 2,103.20
Options Outstanding, Weighted- Average Remaining Contractual Life in Years (Year)	6 years 321 days
Options Exercisable, Number of Options (in shares)	1,922
Options Exercisable, Weighted- Average Exercise Price (in dollars per share)	$ 2,517.03
Options Exercisable, Weighted- Average Remaining Contractual Life in Years (Year)	6 years 222 days
Range One [Member]
Range of Exercise Prices, Lower Range (in dollars per share)	$ 0
Range of Exercise Prices, Upper Range (in dollars per share)	$ 11,484
Options Outstanding, Number of Options (in shares)	2,246
Options Outstanding, Weighted- Average Exercise Price (in dollars per share)	$ 475
Options Outstanding, Weighted- Average Remaining Contractual Life in Years (Year)	7 years 21 days
Options Exercisable, Number of Options (in shares)	1,855
Options Exercisable, Weighted- Average Exercise Price (in dollars per share)	$ 569
Options Exercisable, Weighted- Average Remaining Contractual Life in Years (Year)	6 years 299 days
Range Two [Member]
Range of Exercise Prices, Lower Range (in dollars per share)	$ 11,485
Range of Exercise Prices, Upper Range (in dollars per share)	$ 22,968
Options Outstanding, Number of Options (in shares)	18
Options Outstanding, Weighted- Average Exercise Price (in dollars per share)	$ 17,869
Options Outstanding, Weighted- Average Remaining Contractual Life in Years (Year)	1 year 51 days
Options Exercisable, Number of Options (in shares)	18
Options Exercisable, Weighted- Average Exercise Price (in dollars per share)	$ 17,869
Options Exercisable, Weighted- Average Remaining Contractual Life in Years (Year)	1 year 51 days
Range Three [Member]
Range of Exercise Prices, Lower Range (in dollars per share)	$ 45,936
Range of Exercise Prices, Upper Range (in dollars per share)	$ 57,420
Options Outstanding, Number of Options (in shares)	13
Options Outstanding, Weighted- Average Exercise Price (in dollars per share)	$ 56,460
Options Outstanding, Weighted- Average Remaining Contractual Life in Years (Year)	76 days
Options Exercisable, Number of Options (in shares)	13
Options Exercisable, Weighted- Average Exercise Price (in dollars per share)	$ 56,460
Options Exercisable, Weighted- Average Remaining Contractual Life in Years (Year)	76 days
Range Four [Member]
Range of Exercise Prices, Lower Range (in dollars per share)	$ 57,421
Range of Exercise Prices, Upper Range (in dollars per share)	$ 68,904
Options Outstanding, Number of Options (in shares)	18
Options Outstanding, Weighted- Average Exercise Price (in dollars per share)	$ 60,457
Options Outstanding, Weighted- Average Remaining Contractual Life in Years (Year)	65 days
Options Exercisable, Number of Options (in shares)	18
Options Exercisable, Weighted- Average Exercise Price (in dollars per share)	$ 60,457
Options Exercisable, Weighted- Average Remaining Contractual Life in Years (Year)	65 days
Range Five [Member]
Range of Exercise Prices, Lower Range (in dollars per share)	$ 68,905
Range of Exercise Prices, Upper Range (in dollars per share)	$ 80,348
Options Outstanding, Number of Options (in shares)	7
Options Outstanding, Weighted- Average Exercise Price (in dollars per share)	$ 76,020
Options Outstanding, Weighted- Average Remaining Contractual Life in Years (Year)	1 year 240 days
Options Exercisable, Number of Options (in shares)	7
Options Exercisable, Weighted- Average Exercise Price (in dollars per share)	$ 76,020
Options Exercisable, Weighted- Average Remaining Contractual Life in Years (Year)	1 year 240 days
Range Six [Member]
Range of Exercise Prices, Lower Range (in dollars per share)	$ 91,872
Range of Exercise Prices, Upper Range (in dollars per share)	$ 103,356
Options Outstanding, Number of Options (in shares)	8
Options Outstanding, Weighted- Average Exercise Price (in dollars per share)	$ 98,442
Options Outstanding, Weighted- Average Remaining Contractual Life in Years (Year)	332 days
Options Exercisable, Number of Options (in shares)	8
Options Exercisable, Weighted- Average Exercise Price (in dollars per share)	$ 98,442
Options Exercisable, Weighted- Average Remaining Contractual Life in Years (Year)	332 days
Range Seven [Member]
Range of Exercise Prices, Lower Range (in dollars per share)	$ 103,357
Range of Exercise Prices, Upper Range (in dollars per share)	$ 114,840
Options Outstanding, Number of Options (in shares)	3
Options Outstanding, Weighted- Average Exercise Price (in dollars per share)	$ 106,001
Options Outstanding, Weighted- Average Remaining Contractual Life in Years (Year)	3 days
Options Exercisable, Number of Options (in shares)	3
Options Exercisable, Weighted- Average Exercise Price (in dollars per share)	$ 106,001
Options Exercisable, Weighted- Average Remaining Contractual Life in Years (Year)	3 days

Note 11 - Stock-Based Compens_8

Note 11 - Stock-Based Compensation - Non-Vested Restricted Stock (Details) - Restricted Stock [Member]	12 Months Ended
	Dec. 31, 2018$ / sharesshares
Non-vested at December 31, 2017 (in shares) | shares	155
Non-vested at December 31, 2017 (in dollars per share) | $ / shares	$ 876
Granted (in shares) | shares	290,300
Granted (in dollars per share) | $ / shares	$ 876
Vested (in shares) | shares	(155)
Vested (in dollars per share) | $ / shares	$ 876
Non-vested at December 31, 2018 (in shares) | shares	290,300
Non-vested at December 31, 2018 (in dollars per share) | $ / shares	$ 3.45

Note 12 - Income Taxes (Details

Note 12 - Income Taxes (Details Textual) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)
Income Tax Expense (Benefit), Total	$ 0
Unrecognized Tax Benefits, Ending Balance	0
Domestic Tax Authority [Member]
Operating Loss Carryforwards, Total	378,300
Domestic Tax Authority [Member] | Research Tax Credit Carryforward [Member]
Operating Loss Carryforwards, Total	3,500
State and Local Jurisdiction [Member]
Operating Loss Carryforwards, Total	$ 355,300

Note 12 - Income Taxes - Net De

Note 12 - Income Taxes - Net Deferred Tax Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred tax assets, net:
Net operating loss carryforwards	$ 103,612	$ 100,631
Research and other credits	3,482	3,482
Other temporary differences	3,760	3,266
Deferred tax assets - before valuation allowance	110,854	107,379
Valuation allowance	(110,854)	(107,379)
Net deferred tax assets - after valuation allowance	$ 0	$ 0

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, 2018	Dec. 31, 2017	Dec. 31, 2016
Federal income tax at statutory rate	21.00%	35.00%	35.00%
State income taxes, net of federal benefits	6.20%	7.50%	2.90%
Research and other credits	0.00%	0.00%	(5.80%)
Impact of change in statutory tax rates	(8.80%)	(183.80%)	0.00%
Permanent deductions	(3.70%)	7.50%	(18.00%)
Valuation allowance	(14.70%)	133.80%	(14.10%)
Effective tax rate	0.00%	0.00%	0.00%

Note 14 - Commitments and Con_3

Note 14 - Commitments and Contingencies (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Capital Lease Obligations, Total	$ 0	$ 0
Operating Leases, Rent Expense, Net, Total	1,700	1,600	$ 1,700
Accrual for Environmental Loss Contingencies, Ending Balance	0
Indemnification Agreement [Member]
Loss Contingency Accrual, Ending Balance	$ 0	$ 0

Note 14 - Commitments and Con_4

Note 14 - Commitments and Contingencies - Future Minimum Payments Under Non-Cancelable Operating Leases (Details) $ in Thousands	Dec. 31, 2018USD ($)
Operating Leases, 2019	$ 1,414
Operating Leases, 2020	655
Operating Leases, 2021	218
Operating Leases, 2022
Operating Leases, 2023
Operating Leases, Thereafter
Operating Leases, Total	$ 2,287

Note 15 - Fair Value Measurem_3

Note 15 - Fair Value Measurements and Fair Value of Financial Instruments (Details Textual) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Jun. 20, 2017
Embedded Derivative, Fair Value of Embedded Derivative, Net, Total	$ 400		$ 7,000
Warrants and Rights Outstanding	22	$ 1,951
Series K Warrants [Member] | Monte Carlo Model [Member] | Fair Value, Inputs, Level 3 [Member]
Warrants and Rights Outstanding	20
Convertible 2020 Notes [Member]
Long-term Debt, Fair Value	12,600		$ 13,500
Embedded Derivative, Fair Value of Embedded Derivative, Net, Total	$ 400

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 ($)	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Measurements, Recurring [Member]
Liabilities, fair value	$ 416,000	$ 7,175,000
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	416,000	7,175,000
Fair Value, Measurements, Recurring [Member] | Warrant [Member]
Derivative liability, fair value	22,000	1,951,000
Fair Value, Measurements, Recurring [Member] | Warrant [Member] | Fair Value, Inputs, Level 1 [Member]
Derivative liability, fair value
Fair Value, Measurements, Recurring [Member] | Warrant [Member] | Fair Value, Inputs, Level 2 [Member]
Derivative liability, fair value
Fair Value, Measurements, Recurring [Member] | Warrant [Member] | Fair Value, Inputs, Level 3 [Member]
Derivative liability, fair value	22,000	1,951,000
Fair Value, Measurements, Recurring [Member] | Embedded Derivative [Member]
Derivative liability, fair value	394,000	5,224,000
Fair Value, Measurements, Recurring [Member] | Embedded Derivative [Member] | Fair Value, Inputs, Level 1 [Member]
Derivative liability, fair value
Fair Value, Measurements, Recurring [Member] | Embedded Derivative [Member] | Fair Value, Inputs, Level 2 [Member]
Derivative liability, fair value
Fair Value, Measurements, Recurring [Member] | Embedded Derivative [Member] | Fair Value, Inputs, Level 3 [Member]
Derivative liability, fair value	394,000	5,224,000
Fair Value, Measurements, Nonrecurring [Member]
Assets, fair value	1,047,000	1,916
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member]
Assets, fair value	29,000	189
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member]
Assets, fair value	1,018,000	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]
Corn and finished goods inventory, fair value	1,047,000	1,916,000
Fair Value, Measurements, Nonrecurring [Member] | Corn and Finished Goods Inventory [Member] | Fair Value, Inputs, Level 1 [Member]
Corn and finished goods inventory, fair value	29,000	189,000
Fair Value, Measurements, Nonrecurring [Member] | Corn and Finished Goods Inventory [Member] | Fair Value, Inputs, Level 2 [Member]
Corn and finished goods inventory, fair value	1,018,000	1,727,000
Fair Value, Measurements, 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, 2018USD ($)
Derivative Financial Instruments, Liabilities [Member]
Opening Balance	$ 1,951
Transfers into Level 3
Transfers out of Level 3
Included in earnings	2,976
Included in other comprehensive income
Purchases
Issues
Sales
Settlements	(4,905)
Closing balance	22
Embedded Derivative, 2020 Convertible Notes [Member]
Opening Balance	5,224
Transfers into Level 3
Transfers out of Level 3
Included in earnings	(2,637)
Included in other comprehensive income
Purchases
Issues
Sales
Settlements	(2,193)
Closing balance	$ 394

Note 16 - Segments (Details Tex

Note 16 - Segments (Details Textual) $ in Millions	12 Months Ended
	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)
Number of Operating Segments	2
Intercompany Sales	$ 0.1	$ 0.4

Note 16 - Segments - Informatio

Note 16 - Segments - Information on Business Segments (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Total revenues		$ 32,863	$ 27,536	$ 27,213
Loss from operations		(22,201)	(23,282)	(23,985)
Interest expense		3,237	2,951	7,837
Depreciation and amortization		6,520	6,641	6,747
Acquisitions of plant, property and equipment		3,123	1,906	5,938
Assets	[1]	107,035	88,853
Intersegment Eliminations [Member]
Assets	[2]	(139,326)	(148,412)
Gevo [Member]
Total revenues		1,222	1,097	2,425
Loss from operations		(11,552)	(10,603)	(11,045)
Interest expense		3,237	2,951	7,789
Depreciation and amortization		269	473	738
Acquisitions of plant, property and equipment		27	120	350
Gevo [Member] | Operating Segments [Member]
Assets		105,379	87,507
Gevo Development / Agri-Energy [Member]
Total revenues		31,641	26,439	24,788
Loss from operations		(10,649)	(12,679)	(12,940)
Interest expense				48
Depreciation and amortization		6,251	6,168	6,009
Acquisitions of plant, property and equipment		3,096	1,786	$ 5,588
Gevo Development / Agri-Energy [Member] | Operating Segments [Member]
Assets		$ 140,982	$ 149,758
[1]	All other significant non-cash items relate to the activities of Gevo.
[2]	Includes intercompany sales of $0.1 million and $0.4 million, respectively for hydrocarbon sales.