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Note 5 - Debt (Details Textual) - USD ($) $ / shares in Units, shares in Thousands |  |  |  |  |  | 9 Months Ended | 24 Months Ended |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 28, 2023 | May 16, 2023 | Oct. 04, 2022 | Mar. 02, 2022 | Jul. 06, 2012 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2019 | Jun. 30, 2025 | Dec. 31, 2024 | Nov. 30, 2024 | Aug. 01, 2022 | Jul. 26, 2022 | Dec. 31, 2021 | Feb. 27, 2019 | Jan. 09, 2012
Short-Term Debt |  |  |  |  |  | $ 20,609,000 |  |  |  | $ 26,789,000 |  |  |  |  |  |
Long-Term Debt, Current Maturities |  |  |  |  |  | 266,106,000 |  |  |  | 63,745,000 |  |  |  |  |  |
Long-Term Debt, Excluding Current Maturities |  |  |  |  |  | 66,788,000 |  |  |  | 247,527,000 |  |  |  |  |  |
Debt, Long-Term and Short-Term, Combined Amount |  |  |  |  |  | $ 353,503,000 |  |  |  | $ 338,061,000 |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  |  | $ 11.7 |  |  |  | $ 11.7 |  |  |  |  |  |
Warrants and Rights Outstanding, Term (Year) |  |  |  |  |  | 4 years 10 days |  |  |  | 4 years 9 months 10 days |  |  |  |  |  |
Proceeds from Issuance of Debt |  |  |  |  |  | $ 29,246,000 | $ 12,534,000 |  |  |  |  |  |  |  |  |
Secured Debt |  |  |  |  |  | 0 |  |  |  | $ 169,826,000 |  |  |  |  |  |
AAFK [Member] | Warrants in Connection With Subordinated Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  |  |  |  |  | 113 |  |  |  |  |  |  | 113
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.01 |  |  |  |  |  |  | $ 0.01
Warrants and Rights Outstanding, Term (Year) |  |  |  |  |  |  |  |  | 2 years |  |  |  |  |  |  | 2 years
Third Eye Capital [Member] | Chief Executive Officer [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount Guaranteed by Related Party |  | $ 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Third Eye Capital [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-Term Debt |  |  |  |  | $ 18,000,000 | 33,500,000 |  |  |  |  |  |  |  |  |  |
Debt Issuance Costs, Net |  |  |  |  |  | $ 200,000 |  |  |  |  |  |  |  |  |  |
Third Eye Capital [Member] | Revolving Credit Facility [Member] | Prime Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  | 13.75% | 21.00% |  |  |  |  |  |  |  |  |  |
Third Eye Capital [Member] | Acquisition Term Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  | $ 15,000,000 |  |  |  |  |  |  |  |  |  |  |
Revolving Notes Series B [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-Term Debt |  |  |  |  |  | $ 81,600,000 |  |  |  |  |  |  |  |  |  |
Debt Issuance Costs, Net |  |  |  |  |  | $ 500,000 |  |  |  |  |  |  |  |  |  |
Revolving Notes Series B [Member] | Revolving Credit Facility [Member] | Prime Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 13.75% |  |  |  | 21.00% |  |  |  |  |  |  |  |  |  |
Term Loan [Member] | Third Eye Capital [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  | 7,200,000 |  |  |  |  |  |  |  |  |  |  |
Revenue Participation Term Notes [Member] | Third Eye Capital [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  | $ 10,000,000 |  |  |  |  |  |  |  |  |  |  |
Short-Term Debt |  |  |  |  |  | $ 12,300,000 |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Issuance Costs, Net |  |  |  |  |  | 57,800 |  |  |  |  |  |  |  |  |  |
Term Notes [Member] | Third Eye Capital [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-Term Debt |  |  |  |  |  | 7,300,000 |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 14.00% |  |  |  |  |  |  |  |  |  |  |
Debt Issuance Costs, Net |  |  |  |  |  | 36,200 |  |  |  |  |  |  |  |  |  |
Acquisition Term Notes [Member] | Third Eye Capital [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-Term Debt |  |  |  |  |  | 27,100,000 |  |  |  |  |  |  |  |  |  |
Debt Issuance Costs, Net |  |  |  |  |  | $ 100,000 |  |  |  |  |  |  |  |  |  |
Acquisition Term Notes [Member] | Third Eye Capital [Member] | Aemetis Facility Keyes, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Fee |  |  |  |  |  |  |  |  | $ 7,500,000 |  |  |  |  |  |  |
Acquisition Term Notes [Member] | Third Eye Capital [Member] | Prime Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  | 10.75% | 18.00% |  |  |  |  |  |  |  |  |  |
Fuels Revolving Line [Member] | GAFI [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 15.00% |  |  |  |  |  |  |  |  |  |  |  |
Fuels Revolving Line [Member] | Prime Rate [Member] | GAFI [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-Term Debt |  |  |  |  |  | $ 47,100,000 |  |  |  |  |  |  |  | $ 41,700,000 |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  | 11.00% |  |  |  |  |  |  |  |  |  |  |  |
Carbon Revolving Line [Member] | ACCI [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Issuance Costs, Net |  |  |  |  |  | 400,000 |  |  |  | 1,100,000 |  |  |  |  |  |
Long-Term Debt, Current Maturities |  |  |  |  |  | 29,200,000 |  |  |  | 2,500,000 |  |  |  |  |  |
Long-Term Debt, Excluding Current Maturities |  |  |  |  |  |  |  |  |  | 24,900,000 |  |  |  |  |  |
Carbon Revolving Line [Member] | ACCI [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 8.00% |  |  |  |  |  |  |  |  |  |  |  |
Carbon Revolving Line [Member] | Prime Rate [Member] | ACCI [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  | 4.00% |  |  |  |  |  |  |  |  |  |  |  |
Cilion Shareholder Seller Notes Payable [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  | $ 5,000,000 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 3.00% |  |  |  |  |  |  |  |  |  |  |
Debt, Long-Term and Short-Term, Combined Amount |  |  |  |  |  | 7,407,000 |  |  | $ 7,400,000 | 7,242,000 |  |  |  |  |  |
Subordinated Notes [Member] | AAFK [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-Term Debt |  |  |  |  |  | 20,900,000 |  |  |  | 19,400,000 |  |  |  |  |  |
Debt Issuance Costs, Net |  |  |  |  |  | 300,000 |  |  |  | 0 |  |  |  |  |  |
Debt Instrument, Fee Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,400,000
Debt Instrument Fee Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00%
Debt Extension Fee, Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00%
EB5 Phase I Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, Long-Term and Short-Term, Combined Amount |  |  |  |  |  | 34,800,000 |  |  |  | 34,600,000 |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Price (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 30 |
EB-5 Promissory Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, Long-Term and Short-Term, Combined Amount |  |  |  |  |  | 39,297,000 |  |  |  | 41,615,000 |  |  |  |  |  |
Proceeds from Issuance of Debt |  |  |  |  |  |  |  | $ 4,000,000 |  |  |  |  |  |  |  |
EB5 Phase II Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, Long-Term and Short-Term, Combined Amount |  |  |  |  |  | 4,500,000 |  |  |  | 4,500,000 |  |  |  |  |  |
Secunderabad Oils [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-Term Debt |  |  |  |  |  | $ 0 |  |  |  | 5,100,000 |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  |  |  | 18.00% |  |  |
Debt Agreement, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,600,000 |  |  |
Leo Edibles & Fats Limited [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Agreement, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  |  |  |  | $ 1,270,000 |  |  |  |
India Biodiesel Factoring Arrangement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 8.10% |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Secured Debt |  |  |  |  |  | $ 23,000,000 |  |  |  |  |  |  |  |  |  |
Secured Debt |  |  |  |  |  | 0 |  |  |  | 0 |  |  |  |  |  |
Construction Loan Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 9.25% |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, Long-Term and Short-Term, Combined Amount |  |  |  |  |  | 48,961,000 |  |  |  | 48,235,000 |  |  |  |  |  |
Debt Agreement, Maximum Borrowing Capacity |  |  | $ 25,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  | 24,600,000 |  |  |  | 25,100,000 |  |  |  |  |  |
Construction Loan Agreement [Member] | US Treasury (UST) Interest Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Construction Loan Agreement 2 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 8.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Issuance Costs, Net |  |  |  |  |  | 800,000 |  |  |  |  |  |  |  |  |  |
Debt Agreement, Maximum Borrowing Capacity | $ 25,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  | 25,100,000 |  |  |  | 23,900,000 |  |  |  |  |  |
Construction Loan Agreement 2 [Member] | US Treasury (UST) Interest Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Jessup Land Acquisition Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  | $ 840,000 |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  | 11.99% |  |  |  |  |
Long-Term Debt |  |  |  |  |  | $ 550,000 |  |  |  | $ 840,000 |  |  |  |  |  |

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