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Note 9 - Stock-Based Compensation - Share-Based Compensation Arrangement by Share-Based Payment Award, Options Vested and Expected to Vest, Outstanding, and Exercisable (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 24 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Vested and Exercisable, number of shares (in shares) 3,986 3,170
Vested and Exercisable, weighted average exercise price (in dollars per share) $ 3.58 $ 2.46
Vested and Exercisable, remaining contractual term (Year) 6 years 5 months 19 days 6 years 11 months 23 days
Vested and Exercisable, aggregate intrinsic value [1] $ 11,695 $ 7,419
Unvested, number of share (in shares) 1,540 1,524
Unvested, weighted average exercise price (in dollars per share) $ 6.55 $ 9.13
Unvested, remaining contractual term (Year) 8 years 8 months 1 day 8 years 9 months 21 days
Unvested, aggregate intrinsic value [1] $ 1,621 $ 647
Number of shares (in shares) 5,526 4,694
Weighted average exercise price (in dollars per share) $ 4.42 $ 4.63
Remaining contractual term (Year) 7 years 14 days 7 years 6 months 29 days
Aggregate intrinsic value [1] $ 13,316 $ 8,066
[1] Intrinsic value based on the $5.24 and $3.96 closing price of Aemetis, Inc. common stock on December 31, 2023 and 2022 respectively, as reported on the NASDAQ Exchange.