Note 10 - Equity Incentive Plans	12 Months Ended
Dec. 31, 2019
Notes to Financial Statements
Stock Incentive Plans Disclosure [Text Block]	10 . Equity Incentive Plans 2006 Omnibus Securities and Incentive Plan . During 2006, the Company established the Gevo, Inc. 2006 Omnibus Securities and Incentive Plan (the “2006 Plan”). Pursuant to the 2006 Plan, the Company granted stock awards to employees and directors of the Company. Upon adoption of the Gevo, Inc. 2010 Stock Incentive Plan (as amended and restated, the “2010 Plan”), no further grants can be made under the 2006 Plan. At December 31, 2019, there were no remaining shares available for future grants of stock awards. To the extent outstanding awards under the 2006 Plan expire, or are forfeited, cancelled, settled, or become unexercisable without the issuance of shares, the shares of common stock subject to such awards will be available for future issuance under the 2010 Plan. 2010 Stock Incentive Plan . In February 2011, the Company’s stockholders approved the Gevo, Inc. 2010 Plan. The 2010 Plan provided for the grant of non-qualified stock options, incentive stock options, stock appreciation rights, restricted stock awards, restricted stock units and other equity awards to employees and directors of the Company. On June 10, 2019, the 2010 Plan was amended and restated, which increased the number of shares of common stock reserved for issuance to 3,266,661 shares. In July 2019, the Company issued 254,500 shares of common stock in relation to restricted stock awards granted on August 9, 2018. In July 2019, the Company also issued 1,283,032 shares of common stock in relation to restricted stock awards granted on June 24, 2019 and 25,581 shares of common stock in relation to restricted stock awards granted on August 8, 2019, in each case vesting over two years, to its employees and directors. In August 2019, the Company withheld 79,790 shares of common stock to settle income taxes related to the vested restricted stock awards for certain employees. At December 31, 2019, an additional 1,785,829 shares were available for issuance upon the exercise of outstanding stock option awards or the grant of stock appreciation rights and restricted stock awards under the 2010 Plan. Employee Stock Purchase Plan . In February 2011, the Company’s stockholders approved the Employee Stock Purchase Plan (the "ESPP"). The offering periods for the ESPP are from January 1 to June 30 and from July 1 to December 31 of each calendar year. The Company has reserved 190 shares of common stock for issuance under the ESPP, of which 190 shares as of December 31, 2019 are available for future issuance. The purchase price of the common stock under the ESPP is 85% of the lower of the fair market value of a share of common stock on the first or last day of the purchase period. There were no purchases of common stock under the ESPP during 2019.

. Equity Incentive Plans

2006

Omnibus Securities and Incentive Plan

. During

2006,

the Company established the Gevo, Inc.

2006

Omnibus Securities and Incentive Plan (the

“2006

Plan”). Pursuant to the

2006

Plan, the Company granted stock awards to employees and directors of the Company. Upon adoption of the Gevo, Inc.

2010

Stock Incentive Plan (as amended and restated, the

“2010

Plan”),

further grants can be made under the

2006

Plan. At

December 31, 2019,

there were

remaining shares available for future grants of stock awards. To the extent outstanding awards under the

2006

Plan expire, or are forfeited, cancelled, settled, or become unexercisable without the issuance of shares, the shares of common stock subject to such awards will be available for future issuance under the

2010

Plan.

2010

Stock Incentive Plan

. In

February 2011,

the Company’s stockholders approved the Gevo, Inc.

2010

Plan. The

2010

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

June 10, 2019,

the

2010

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

3,266,661

shares. In

July 2019,

the Company issued

254,500

shares of common stock in relation to restricted stock awards granted on

August 9, 2018.

July 2019,

the Company also issued

1,283,032

shares of common stock in relation to restricted stock awards granted on

June 24, 2019

and

25,581

shares of common stock in relation to restricted stock awards granted on

August 8, 2019,

in each case vesting over

two

years, to its employees and directors. In

August 2019,

the Company withheld

79,790

shares of common stock to settle income taxes related to the vested restricted stock awards for certain employees. At

December 31, 2019,

an additional

1,785,829

shares were available for issuance upon the exercise of outstanding stock option awards or the grant of stock appreciation rights and restricted stock awards under the

2010

Plan.

Employee Stock Purchase Plan

. In

February 2011,

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

January 1

June 30

and from

July 1

December 31

of each calendar year. The Company has reserved

190

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

190

shares as of

December 31, 2019

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

85%

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

first

or last day of the purchase period. There were

purchases of common stock under the ESPP during

2019.