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Note 5 - Debt (Details Textual) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended | 89 Months Ended |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 12, 2025 | Jul. 28, 2023 | May 16, 2023 | Oct. 04, 2022 | Mar. 02, 2022 | Jul. 06, 2012 | Dec. 31, 2024 | Dec. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2024 | Nov. 30, 2024 | Jul. 31, 2024 | Jul. 01, 2024 | Mar. 31, 2023 | Dec. 31, 2022 | Aug. 01, 2022 | Jul. 26, 2022 | May 01, 2020 | Feb. 27, 2019 | Jan. 09, 2012
Long-Term Debt |  |  |  |  |  |  | $ 338,061 | $ 338,061 |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  |  |  |  |  |  |  | 19,461 | $ 75,482 |  |  |  |  |  |  |  |  |  |  |
Short-Term Debt |  |  |  |  |  |  | $ 26,789 | $ 26,789 | $ 23,443 |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  |  |  | $ 11.7 | $ 11.7 | $ 11.7 |  |  |  |  |  | $ 15.92 |  |  |  |  |
Warrants and Rights Outstanding, Term (Year) |  |  |  |  |  |  | 4 years 9 months 10 days | 4 years 9 months 10 days | 5 years 9 months 7 days |  |  |  |  |  | 7 years 5 months 23 days |  |  |  |  |
Gain (Loss) on Extinguishment of Debt |  |  |  |  |  |  |  | $ 162 | $ (0) |  |  |  |  |  |  |  |  |  |  |
Debt, Long-Term and Short-Term, Combined Amount |  |  |  |  |  |  | $ 338,061 | 338,061 | 294,721 |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt, Current Maturities |  |  |  |  |  |  | 63,745 | 63,745 | 13,585 |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt, Excluding Current Maturities |  |  |  |  |  |  | 247,527 | $ 247,527 | 257,693 |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  |  |  |  |  |  | Selling, General and Administrative Expense |  |  |  |  |  |  |  |  |  |  |  |
Mitsubishi Chemical America, Inc. (“MCA”) [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Certain Equipment at the Keyes Plant [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment, Noncurrent |  |  |  |  |  |  | 9,600 | $ 9,600 |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Long-term Debt, Current |  |  |  |  |  |  | 3,600 | 3,600 |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Short-term Debt, Current |  |  |  |  |  |  | 2,200 | 2,200 |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Accounts Payable, Current |  |  |  |  |  |  | 200 | 200 |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal |  |  |  |  |  |  |  | (3,600) |  |  |  |  |  |  |  |  |  |  |  |
AAFK [Member] | Warrants in Connection With Subordinated Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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
Capital Revolving Credit Facility Fuels And Carbon Lines [Member] | GAFI and ACCI [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  | $ 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fuels Revolving Line [Member] | GAFI [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  | 50,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carbon Revolving Line [Member] | ACCI [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  | $ 50,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Third Eye Capital [Member] | Chief Executive Officer [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount Guaranteed by Related Party |  |  |  |  |  |  | 10,000 | 10,000 |  |  |  |  |  |  |  |  |  |  |  |
Third Eye Capital [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  | $ 18,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  | 31,800 | 31,800 |  |  |  |  |  |  |  |  |  |  |  |
Debt Issuance Costs, Net |  |  |  |  |  |  | $ 400 | $ 400 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  | 21.25% | 21.25% |  |  |  |  |  |  |  |  |  |  |  |
Third Eye Capital [Member] | Revolving Credit Facility [Member] | Prime Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  | 13.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Third Eye Capital [Member] | Acquisition Term Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  | $ 15,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving Notes Series B [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  | $ 68,900 | $ 68,900 |  |  |  |  |  |  |  |  |  |  |  |
Debt Issuance Costs, Net |  |  |  |  |  |  | $ 400 | $ 400 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  | 21.25% | 21.25% |  |  |  |  |  |  |  |  |  |  |  |
Revolving Notes Series B [Member] | Revolving Credit Facility [Member] | Prime Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 13.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term Loan [Member] | Third Eye Capital [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  | 7,200 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue Participation Term Notes [Member] | Third Eye Capital [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  | $ 10,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  | 5.00% |  |  |  |  |  |  |  |  |  |
Revenue Participation Term Notes [Member] | Third Eye Capital [Member] | AAFK [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  | $ 12,200 | $ 12,200 |  |  |  |  |  |  |  |  |  |  |  |
Debt Issuance Costs, Net |  |  |  |  |  |  | 43 | 43 |  |  |  |  |  |  |  |  |  |  |  |
Term Notes [Member] | Third Eye Capital [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  | 7,200 | 7,200 |  |  |  |  |  |  |  |  |  |  |  |
Debt Issuance Costs, Net |  |  |  |  |  |  | $ 29 | $ 29 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  | 14.00% | 14.00% |  |  |  |  |  |  |  |  |  |  |  |
Acquisition Term Notes [Member] | Third Eye Capital [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  | $ 19,400 | $ 19,400 |  |  |  |  |  |  |  |  |  |  |  |
Debt Issuance Costs, Net |  |  |  |  |  |  | $ 135 | $ 135 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  | 18.25% | 18.25% |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Fee |  |  |  |  |  |  | $ 7,500 | $ 7,500 |  |  |  |  |  |  |  |  |  |  |  |
Acquisition Term Notes [Member] | Third Eye Capital [Member] | Prime Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  | 10.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short Term Promissory Note [Member] | Third Eye Capital [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  | 20.50% | 20.50% |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  |  |  |  |  |  | $ 2,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Fuels Revolving Line [Member] | GAFI [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Issuance Costs, Net |  |  |  |  |  |  | $ 400 | $ 400 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  |  |  |  | 13.50% | 13.50% |  |  |  |  |  |  |  |  |  |  |  |
Short-Term Debt |  |  |  |  |  |  | $ 41,700 | $ 41,700 |  |  |  |  |  |  |  |  |  |  |  |
Fuels Revolving Line [Member] | GAFI [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 11.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fuels Revolving Line [Member] | GAFI [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  | 10.00% | 10.00% |  |  |  |  |  |  |  |  |  |  |  |
Fuels Revolving Line [Member] | GAFI [Member] | Minimum [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 15.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fuels Revolving Line [Member] | Prime Rate [Member] | GAFI [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  | 6.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fuels Revolving Line [Member] | Prime Rate [Member] | GAFI [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 11.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carbon Revolving Line [Member] | ACCI [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  | $ 24,900 | $ 24,900 |  |  |  |  |  |  |  |  |  |  |  |
Debt Issuance Costs, Net |  |  |  |  |  |  | $ 1,100 | $ 1,100 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  |  |  |  | 11.50% | 11.50% |  |  |  |  |  |  |  |  |  |  |  |
Short-Term Debt |  |  |  |  |  |  | $ 2,500 | $ 2,500 |  |  |  |  |  |  |  |  |  |  |  |
Carbon Revolving Line [Member] | ACCI [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  | 8.00% | 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  | $ 7,200 | $ 7,200 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  | 3.00% | 3.00% |  |  |  |  |  |  |  |  |  |  |  |
Debt, Long-Term and Short-Term, Combined Amount |  |  |  |  |  |  | $ 7,242 | $ 7,242 | 7,028 |  |  |  |  |  |  |  |  |  |  |
Subordinated Notes [Member] | AAFK [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-Term Debt |  |  |  |  |  |  | 19,400 | 19,400 | 17,600 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Fee Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,400
Debt Instrument Fee Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00%
Debt Extension Fee, Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00%
EB5 Phase I Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Price (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 30 |
EB5 Phase I Notes [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Investment Raised Per Investor |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 800 |  |  |  | $ 500 |  |
EB5 Phase I Notes [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Additional Investment Available to Issue |  |  |  |  |  |  |  |  |  | $ 200,000 |  |  |  |  |  |  |  |  |  |
EB-5 Promissory Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  | 34,600 | 34,600 | 37,900 |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  |  |  |  |  |  |  |  |  | $ 4,000 |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  |  |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |
Gain (Loss) on Extinguishment of Debt |  |  |  |  |  |  |  | 162 |  |  |  |  |  |  |  |  |  |  |  |
Debt, Long-Term and Short-Term, Combined Amount |  |  |  |  |  |  | 39,020 | 39,020 | 42,211 |  |  |  |  |  |  |  |  |  |  |
EB5 Phase II Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, Long-Term and Short-Term, Combined Amount |  |  |  |  |  |  | 4,400 | 4,400 | 4,300 |  |  |  |  |  |  |  |  |  |  |
EB-5 Broker Promissory Note [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  |  | $ 3,300 |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |
Debt, Long-Term and Short-Term, Combined Amount |  |  |  |  |  |  | 2,595 | 2,595 | 0 |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt, Current Maturities |  |  |  |  |  |  | 1,400 | 1,400 |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt, Excluding Current Maturities |  |  |  |  |  |  |  |  | 1,200 |  |  |  |  |  |  |  |  |  |  |
Secunderabad Oils [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 18.00% |  |  |
Short-Term Debt |  |  |  |  |  |  | 5,100 | 5,100 | 3,800 |  |  |  |  |  |  |  |  |  |  |
Debt Agreement, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,600 |  |  |
Leo Edibles & Fats Limited [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Agreement, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,270 |  |  |  |
Construction Loan Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  | 25,100 | 25,100 | 25,100 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 9.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, Long-Term and Short-Term, Combined Amount |  |  |  |  |  |  | 48,235 | 48,235 | 41,024 |  |  |  |  |  |  |  |  |  |  |
Debt Agreement, Maximum Borrowing Capacity |  |  |  | $ 25,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Construction Loan Agreement [Member] | US Treasury (UST) Interest Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Construction Loan Agreement 2 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  | 23,900 | 23,900 | 16,800 |  |  |  |  |  |  |  |  |  |  |
Debt Issuance Costs, Net |  |  |  |  |  |  | 800 | 800 | $ 800 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 8.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Agreement, Maximum Borrowing Capacity |  | $ 25,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  | $ 840 | $ 840 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  | 11.99% |  |  |  |  |  |  |  |  |

X
- Definition Amount guaranteed by related party. + References No definition available. + Details
Name: | amtx_AmountGuaranteedByRelatedParty
Namespace Prefix: | amtx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Represents maximum borrowing capacity under debt agreement. + References No definition available. + Details
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