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Note 10 - Equity Incentive Plans
 6 Months Ended
Jun. 30, 2020
Notes to Financial Statements  
Stock Incentive Plans Disclosure [Text Block]
10
. Equity Incentive Plans
 
2010
Stock Incentive Plan
. In
February 2011,
the Company's stockholders approved the Gevo, Inc.
2010
Stock Incentive Plan (as amended and restated to date, the
"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. On
June 3, 2020,
the
2010
Plan was amended and restated, which increased the number of shares of common stock reserved for issuance by
3,713,413
shares to a total of
6,980,074
shares.
 
In
February 2020,
the Company issued
109,337
 shares of restricted common stock, vesting over
three
years, and
1,258
shares of restricted common stock, vesting over
two
years, to certain of its employees in relation to restricted stock awards granted on
February 27, 2020.
In
March 2020,
the Company withheld
4,055
shares of common stock to settle income taxes related to the vested restricted stock awards for certain employees. In
April 2020,
the Company issued
239,155
shares of restricted common stock in relation to restricted stock awards granted to its employees on
April 1, 2020
in connection with the
20%
salary reduction discussed in Footnote
1,
which vested on
May 15, 2020.
Also in
April 2020,
the Company issued
29,032
of restricted stock units in exchange for services rendered which vested immediately. During the
three
months ended
June 30, 
2020,
the Company withheld
286,324
shares of common stock to settle income taxes related to the vested restricted stock awards for certain employees.
 
At
June 30, 2020,
an additional
5,202,941
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.
 
During
July 2020,
the Company issued
115,156
 shares of restricted common stock in relation to restricted stock awards granted to its employees on
July 1, 2020
in connection with the
20%
salary reduction vesting on
July 31, 2020.
In addition, on
July 6, 2020,
the Company issued
3,989,140
shares of restricted common stock to employees and directors and
101,730
restricted stock units in exchange for services rendered, vesting over
two
years.
 
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
June 30, 2020 
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 the
six
months ended
June 30, 2020
or
2019.