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 and Financial Condition Nature of Business . Gevo, Inc. (“Gevo” or the “Company,” which, unless otherwise indicated, refers to Gevo, Inc. and its subsidiaries) is a renewable chemicals and next generation "low-carbon" fuel company focused on the development and commercialization of renewable alternatives to petroleum-based products. Low-carbon fuels reduce the carbon intensity, or the level of greenhouse gas emissions ("GHG"), compared to standard fossil-based fuels across their lifecycle. The most common low-carbon fuels are renewable fuels. Gevo is focused on the development and production of mainstream fuels like gasoline and jet fuel using renewable feedstocks that have the potential to lower GHG at a meaningful scale and enhance agricultural production, including food and other related products. In addition to serving the low-carbon fuel markets, through Gevo's technology, Gevo can also serve markets for the production of chemical intermediate products for solvents, plastics and building block chemicals. 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 million gallons per year of ethanol, 45 - 50 kilotons of animal feed, and 3 million pounds of corn oil. As of December 31, 2018, the Company continues to engage in research and development, business development, business and financial planning, optimizing operations for low-carbon ethanol, isobutanol, and related hydrocarbons production and raising capital to fund future expansion of its Luverne Facility. Ultimately, the Company believes that the attainment of profitable operations is dependent upon future events, including (i) completing certain capital improvements at the Luverne Facility to produce low-carbon ethanol side-by-side with low-carbon isobutanol; (ii) completing the Company's development activities resulting in commercial production and sales of low-carbon ethanol, isobutanol, or isobutanol derived products and/or technology; (iii) obtaining adequate financing to complete the Company's development activities, including the build out of low-carbon ethanol capacity and further isobutanol and hydrocarbon capacity (iv) gaining market acceptance and demand for the Company's products and services; (v) attracting and retaining qualified personnel; and (vi) the achievement of a level of revenues adequate to support the Company's cost structure. Financial Condition . For the year ended December 31, 2018 and 2017, the Company incurred a consolidated net loss of $28.0 million and $24.6 million, respectively, and had an accumulated deficit of $429.3 million at December 31, 2018. The Company’s cash and cash equivalents at December 31, 2018 totaled $33.7 million and are expected to be used for the following purposes: (i) operating activities of the Luverne Facility; (ii) operating activities at the Company’s corporate headquarters in Colorado, including research and development work; (iii) capital improvements primarily associated with the Luverne Facility; (iv) exploration of strategic alternatives and new financings; and (v) debt service obligations. The Company expects to incur future net losses as it continues to fund the development and commercialization of its product candidates. To date, the Company has financed its operations primarily with proceeds from 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 never achieve profitability or positive cash flows, and unless and until it does, the Company will continue to need to raise additional cash. Management intends to fund future operations through additional private and/or public offerings of debt or equity securities. In addition, the Company may seek additional capital through arrangements with strategic partners or from other sources, it may seek to restructure its debt and it will continue to address its cost structure. Notwithstanding, there can be no assurance that the Company will be able to raise additional funds, or achieve or sustain profitability or positive cash flows from operations. At-the-Market Offering Program. In February 2018, the Company commenced an at-the-market offering program, which allowed it to sell and issue shares of its common stock. The at-the-market offering program was amended multiple times during 2018 to increase the available capacity under the at-the-market offering program by an aggregate of approximately $84.9 million. As of December 31, 2018, the Company has remaining capacity to issue and sell up to approximately $44.6 million of additional shares of common stock under the at-the-market offering program. During the year ended December 31, 2018, the Company issued 6,936,930 shares of common stock (after giving effect to the Reverse Stock Split (as defined below) under the at-the-market offering program for gross proceeds of $40.3 million. The Company paid commissions to its sales agent of approximately $0.9 million and incurred other offering related expenses of $0.5 million during the year ended December 31, 2018. During the three months ended December 31, 2018, the Company issued 545,313 shares of common stock, for gross proceeds of $2.5 million. The Company paid commissions to its sales agent of approximately $0.1 million and incurred other offering related expenses of less than $0.1 million. The Company issued and sold 3,244,941 shares of common stock under the at-the-market offering program, for gross proceeds of $9.9 million after December 31, 2018. Reverse Stock Split. On June 1, 2018, the Company effected a reverse stock split of the outstanding shares of its common stock by a ratio of one -for- twenty (the "Reverse Stock Split"), and its common stock began trading on the Nasdaq Capital Market on a Reverse Stock Split-basis on June 4, 2018. Unless otherwise indicated, all share amounts, per share data, share prices, exercise prices and conversion rates set forth in these notes and the accompanying consolidated financial statements have, where applicable, been adjusted retroactively to reflect this Reverse Stock Split.

Nature of Business and Financial Condition

Nature of Business

. Gevo, Inc. (“Gevo” or the “Company,” which, unless otherwise indicated, refers to Gevo, Inc. and its subsidiaries) is a renewable chemicals and next generation "low-carbon" fuel company focused on the development and commercialization of renewable alternatives to petroleum-based products. Low-carbon fuels reduce the carbon intensity, or the level of greenhouse gas emissions ("GHG"), compared to standard fossil-based fuels across their lifecycle. The most common low-carbon fuels are renewable fuels. Gevo is focused on the development and production of mainstream fuels like gasoline and jet fuel using renewable feedstocks that have the potential to lower GHG at a meaningful scale and enhance agricultural production, including food and other related products. In addition to serving the low-carbon fuel markets, through Gevo's technology, Gevo can also serve markets for the production of chemical intermediate products for solvents, plastics and building block chemicals.

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

million gallons per year of ethanol,

kilotons of animal feed, and

million pounds of corn oil.

As of

December 31, 2018,

the Company continues to engage in research and development, business development, business and financial planning, optimizing operations for low-carbon ethanol, isobutanol, and related hydrocarbons production and raising capital to fund future expansion of its Luverne Facility. Ultimately, the Company believes that the attainment of profitable operations is dependent upon future events, including (i) completing certain capital improvements at the Luverne Facility to produce low-carbon ethanol side-by-side with low-carbon isobutanol; (ii) completing the Company's development activities resulting in commercial production and sales of low-carbon ethanol, isobutanol, or isobutanol derived products and/or technology; (iii) obtaining adequate financing to complete the Company's development activities, including the build out of low-carbon ethanol capacity and further isobutanol and hydrocarbon capacity (iv) gaining market acceptance and demand for the Company's products and services; (v) attracting and retaining qualified personnel; and (vi) the achievement of a level of revenues adequate to support the Company's cost structure.

Financial Condition

. For the year ended

December 31, 2018

and

2017,

the Company incurred a consolidated net loss of

$28.0

million and

$24.6

million, respectively, and had an accumulated deficit of

$429.3

million at

December 31, 2018.

The Company’s cash and cash equivalents at

December 31, 2018

totaled

$33.7

million and are expected to be used for the following purposes: (i) operating activities of the Luverne Facility; (ii) operating activities at the Company’s corporate headquarters in Colorado, including research and development work; (iii) capital improvements primarily associated with the Luverne Facility;

(iv) exploration of strategic alternatives and new financings;

and (v) debt service obligations.

The Company expects to incur future net losses as it continues to fund the development and commercialization of its product candidates. To date, the Company has financed its operations primarily with proceeds from 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

never achieve profitability or positive cash flows, and unless and until it does, the Company will continue to need to raise additional cash. Management intends to fund future operations through additional private and/or public offerings of debt or equity securities. In addition, the Company

may

seek additional capital through arrangements with strategic partners or from other sources, it

may

seek to restructure its debt and it will continue to address its cost structure. Notwithstanding, there can be

assurance that the Company will be able to raise additional funds, or achieve or sustain profitability or positive cash flows from operations.

At-the-Market Offering Program.

February 2018,

the Company commenced an at-the-market offering program, which allowed it to sell and issue shares of its common stock. The at-the-market offering program was amended multiple times during

2018

to increase the available capacity under the at-the-market offering program by an aggregate of approximately

$84.9

million. As of

December 31, 2018,

the Company has remaining capacity to issue and sell up to approximately

$44.6

million of additional shares of common stock under the at-the-market offering program.

During the year ended

December 31, 2018,

the Company issued

6,936,930

shares of common stock (after giving effect to the Reverse Stock Split (as defined below) under the at-the-market offering program for gross proceeds of

$40.3

million. The Company paid commissions to its sales agent of approximately

$0.9

million and incurred other offering related expenses of

$0.5

million during the year ended

December 31, 2018.

During the

three

months ended

December 31, 2018,

the Company issued

545,313

shares of common stock, for gross proceeds of

$2.5

million. The Company paid commissions to its sales agent of approximately

$0.1

million and incurred other offering related expenses of less than

$0.1

million.

The Company issued and sold

3,244,941

shares of common stock under the at-the-market offering program, for gross proceeds of

$9.9

million after

December 31, 2018.

Reverse Stock Split.

June 1, 2018,

the Company effected a reverse stock split of the outstanding shares of its common stock by a ratio of

one

-for-

twenty

(the "Reverse Stock Split"), and its common stock began trading on the Nasdaq Capital Market on a Reverse Stock Split-basis on

June 4, 2018.

Unless otherwise indicated, all share amounts, per share data, share prices, exercise prices and conversion rates set forth in these notes and the accompanying consolidated financial statements have, where applicable, been adjusted retroactively to reflect this Reverse Stock Split.