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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.

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- Definition Amount by which current fair value of underlying stock exceeds exercise price of unvested options outstanding. + References No definition available. + Details
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- Definition Weighted average remaining contractual term for nonvested options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References No definition available. + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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