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Note 7 - Debt (Details Textual) - USD ($) |  |  |  |  |  | 3 Months Ended | 9 Months Ended | 89 Months Ended |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 28, 2023 | May 16, 2023 | Oct. 04, 2022 | Mar. 02, 2022 | Jul. 06, 2012 | Sep. 30, 2024 | Sep. 30, 2024 | Sep. 30, 2023 | Mar. 31, 2024 | Jul. 31, 2024 | Jul. 01, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | Aug. 01, 2022 | Jul. 26, 2022 | May 01, 2020 | Mar. 06, 2020 | Feb. 27, 2019 | Jan. 09, 2012
Long-Term Debt |  |  |  |  |  | $ 322,206,000 | $ 322,206,000 |  |  |  |  |  |  |  |  |  |  |  |
Short-Term Debt |  |  |  |  |  | $ 21,418,000 | $ 21,418,000 |  |  |  |  | $ 23,443,000 |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  |  | $ 11.7 | $ 11.7 |  |  |  |  | $ 11.7 |  |  |  |  |  |  |
Warrants and Rights Outstanding, Term (Year) |  |  |  |  |  | 5 years 10 days | 5 years 10 days |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Extinguishment of Debt |  |  |  |  |  |  | $ 162,000 | $ (0) |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  |  |  |  |  |  | 12,534,000 | $ 41,449,000 |  |  |  |  |  |  |  |  |  |  |
Debt, Long-Term and Short-Term, Combined Amount |  |  |  |  |  | $ 322,206,000 | 322,206,000 |  |  |  |  | $ 294,721,000 |  |  |  |  |  |  |
Long-Term Debt, Current Maturities |  |  |  |  |  | 55,797,000 | 55,797,000 |  |  |  |  | 13,585,000 |  |  |  |  |  |  |
Long-Term Debt, Excluding Current Maturities |  |  |  |  |  | 244,991,000 | 244,991,000 |  |  |  |  | 257,693,000 |  |  |  |  |  |  |
Property, Plant and Equipment, Net |  |  |  |  |  | 195,939,000 | 195,939,000 |  |  |  |  | 195,108,000 |  |  |  |  |  |  |
Accounts Payable, Current |  |  |  |  |  | 37,254,000 | 37,254,000 |  |  |  |  | 32,132,000 |  |  |  |  |  |  |
Other Long-Term Debt, Noncurrent |  |  |  |  |  | 54,583,000 | 54,583,000 |  |  |  |  | 51,717,000 |  |  |  |  |  |  |
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 |  |  |  | $ 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fuels Revolving Line [Member] | GAFI [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carbon Revolving Line [Member] | ACCI [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | $ 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Third Eye Capital [Member] | Mr. McAfee [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Amount at Risk by Product and Guarantee, Net Amount at Risk |  |  |  |  |  | 10,000,000 | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Third Eye Capital [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  | $ 18,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  | 30,500,000 | 30,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt Issuance Costs, Net |  |  |  |  |  | $ 600,000 | $ 600,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 21.75% | 21.75% |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  | $ 15,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving Notes Series B [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  | $ 65,200,000 | $ 65,200,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt Issuance Costs, Net |  |  |  |  |  | $ 500,000 | $ 500,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 21.75% | 21.75% |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  | 7,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  | $ 7,200,000 | $ 7,200,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt Issuance Costs, Net |  |  |  |  |  | 55,800 | 55,800 |  |  |  |  |  |  |  |  |  |  |  |
Revenue Participation Term Notes [Member] | Third Eye Capital [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  | $ 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  | 5.00% |  |  |  |  |  |  |  |  |  |
Revenue Participation Term Notes [Member] | Third Eye Capital [Member] | AAFK [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  | 12,200,000 | 12,200,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt Issuance Costs, Net |  |  |  |  |  | $ 86,100 | $ 86,100 |  |  |  |  |  |  |  |  |  |  |  |
Term Notes [Member] | Third Eye Capital [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 14.00% | 14.00% |  |  |  |  |  |  |  |  |  |  |  |
Extension Fee |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Extension Fee, Percentage Payable by Increasing Debt Outstanding |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Extension Fee, Percentage Payable with Cash |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Extension Fee, Percentage Payable with Common Stock |  |  |  |  |  | 110.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition Term Notes [Member] | Third Eye Capital [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  | $ 26,900 | $ 26,900 |  |  |  |  |  |  |  |  |  |  |  |
Debt Issuance Costs, Net |  |  |  |  |  | $ 187,100 | $ 187,100 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 18.75% | 18.75% |  |  |  |  |  |  |  |  |  |  |  |
Acquisition Term Notes [Member] | Third Eye Capital [Member] | Aemetis Facility Keyes, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Fee |  |  |  |  |  | $ 7,500,000 | $ 7,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Acquisition Term Notes [Member] | Third Eye Capital [Member] | Prime Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  | 10.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reserve Liquidity Facility [Member] | Third Eye Capital [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 18,000,000 |  |
Long-Term Debt |  |  |  |  |  | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 85,000,000 |  |
Debt Instrument, Non-refundable Standby Fee, Percent of Difference Between Principal Amount and the Commitment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.00% |  |
Dbet Instrument, Non Refundable One Time Fees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000 |  |
Reserve Liquidity Facility Paid Monthly in Arrears [Member] | Third Eye Capital [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30.00% |  |
Reserve Liquidity Facility if Event of Default Occurred and Continues [Member] | Third Eye Capital [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40.00% |  |
Fuels Revolving Line [Member] | GAFI [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fuels Revolving Line [Member] | Prime Rate [Member] | GAFI [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  | 6.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carbon Revolving Line [Member] | GAFI [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Issuance Costs, Net |  |  |  |  |  | 900,000 | 900,000 |  |  |  |  |  |  |  |  |  |  |  |
Short-Term Debt |  |  |  |  |  | 40,200,000 | 40,200,000 |  |  |  |  |  |  |  |  |  |  |  |
Carbon Revolving Line [Member] | ACCI [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  | 24,900,000 | 24,900,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt Issuance Costs, Net |  |  |  |  |  | 1,100,000 | 1,100,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 8.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-Term Debt |  |  |  |  |  | 1,600,000 | 1,600,000 |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  | 7,200,000 | 7,200,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 3.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, Long-Term and Short-Term, Combined Amount |  |  |  |  |  | 7,188,000 | 7,188,000 |  |  |  |  | 7,028,000 |  |  |  |  |  |  |
Subordinated Notes [Member] | AAFK [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-Term Debt |  |  |  |  |  | 18,800,000 | 18,800,000 |  |  |  |  | 17,600,000 |  |  |  |  |  |  |
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 Instrument, Convertible, Conversion Price (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 30 |
Proceeds from Issuance of Debt |  |  |  |  |  |  |  |  | $ 4,000,000 |  |  |  |  |  |  |  |  |  |
EB5 Phase I Notes [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Additional Investment Available to Issue |  |  |  |  |  |  |  |  | $ 200,000,000 |  |  |  |  |  |  |  |  |  |
EB5 Phase I Notes [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Investment Raised Per Investor |  |  |  |  |  |  |  |  |  |  |  |  | $ 800,000 |  |  | $ 500,000 |  |  |
EB-5 Promissory Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  | 34,500,000 | 34,500,000 |  |  |  |  | 37,900,000 |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |  |
Gain (Loss) on Extinguishment of Debt |  |  |  |  |  |  | 162,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt, Long-Term and Short-Term, Combined Amount |  |  |  |  |  | 38,925,000 | 38,925,000 |  |  |  |  | 42,211,000 |  |  |  |  |  |  |
EB5 Phase II Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, Long-Term and Short-Term, Combined Amount |  |  |  |  |  | 4,400,000 | 4,400,000 |  |  |  |  | 4,400,000 |  |  |  |  |  |  |
EB-5 Broker Promissory Note [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  | $ 3,300,000 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |
Debt, Long-Term and Short-Term, Combined Amount |  |  |  |  |  | 2,775,000 | 2,775,000 |  |  |  |  | 0 |  |  |  |  |  |  |
Long-Term Debt, Current Maturities |  |  |  |  |  | 1,300,000 | 1,300,000 |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt, Excluding Current Maturities |  |  |  |  |  | 1,500,000 | 1,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Secunderabad Oils [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 18.00% |  |  |  |
Short-Term Debt |  |  |  |  |  | 2,600,000 | 2,600,000 |  |  |  |  | 3,800,000 |  |  |  |  |  |  |
Debt Agreement, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,600,000 |  |  |  |
Leo Edibles & Fats Limited [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Agreement, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,270,000 |  |  |  |  |
Construction Loan Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  | 25,100,000 | 25,100,000 |  |  |  |  | 25,100,000 |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 9.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, Long-Term and Short-Term, Combined Amount |  |  |  |  |  | 46,585,000 | 46,585,000 |  |  |  |  | 41,024,000 |  |  |  |  |  |  |
Debt Agreement, Maximum Borrowing Capacity |  |  | $ 25,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  | 22,300,000 | 22,300,000 |  |  |  |  | 16,800,000 |  |  |  |  |  |  |
Debt Issuance Costs, Net |  |  |  |  |  | 800,000 | 800,000 |  |  |  |  | $ 800,000 |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 8.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Agreement, Maximum Borrowing Capacity | $ 25,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Construction Loan Agreement 2 [Member] | US Treasury (UST) Interest Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Agreement For Capital Expenditures [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  | 3,600,000 | 3,600,000 |  |  |  |  |  |  |  |  |  |  |  |
Short-Term Debt |  |  |  |  |  | 2,200,000 | 2,200,000 |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Net |  |  |  |  |  | 9,600,000 | 9,600,000 |  |  |  |  |  |  |  |  |  |  |  |
Accounts Payable, Current |  |  |  |  |  | 200,000 | 200,000 |  |  |  |  |  |  |  |  |  |  |  |
Other Long-Term Debt, Noncurrent |  |  |  |  |  | $ 3,600,000 | $ 3,600,000 |  |  |  |  |  |  |  |  |  |  |  |

X
- Definition Represents maximum borrowing capacity under debt agreement. + References No definition available. + Details
Name: | amtx_DebtAgreementMaximumBorrowingCapacity
Namespace Prefix: | amtx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The percentage of debt extension fee. + References No definition available. + Details
Name: | amtx_DebtExtensionFeePercentage
Namespace Prefix: | amtx_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Additional amount of investment available to issue under debt instrument. + References No definition available. + Details
Name: | amtx_DebtInstrumentAdditionalInvestmentAvailableToIssue
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