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Note 7 - Debt (Details Textual) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands |  |  |  |  |  |  | 3 Months Ended | 89 Months Ended |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 28, 2023 | May 16, 2023 | Jan. 01, 2023 | Oct. 04, 2022 | Mar. 02, 2022 | Jul. 06, 2012 | Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2024 | Mar. 25, 2024 | Jan. 01, 2024 | Dec. 31, 2023 | Aug. 01, 2022 | Jul. 26, 2022 | May 01, 2020 | Mar. 06, 2020 | Feb. 27, 2019 | Jan. 09, 2012 | Mar. 04, 2011
Long-Term Debt |  |  |  |  |  |  | $ 307,224 |  | $ 307,224 |  |  |  |  |  |  |  |  |  |
Short-Term Debt |  |  |  |  |  |  | $ 23,937 |  | $ 23,937 |  |  | $ 23,443 |  |  |  |  |  |  |
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 6 months 14 days |  | 5 years 6 months 14 days |  |  | 5 years 9 months 7 days |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  |  |  |  |  |  | $ 6,223 | $ 11,583 |  |  |  |  |  |  |  |  |  |  |
Debt, Long-Term and Short-Term, Combined Amount |  |  |  |  |  |  | 307,224 |  | $ 307,224 |  |  | $ 294,721 |  |  |  |  |  |  |
Other Long-Term Debt, Noncurrent |  |  |  |  |  |  | 54,087 |  | 54,087 |  |  | 51,717 |  |  |  |  |  |  |
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 |
Class of Warrant or Right, Issued (in shares) |  |  | 113 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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] | Mr. McAfee [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Amount at Risk by Product and Guarantee, Net Amount at Risk |  |  |  |  |  |  | 10,000 |  | 10,000 |  |  |  |  |  |  |  |  |  |
Third Eye Capital [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  | $ 18,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  | 24,800 |  | 24,800 |  |  |  |  |  |  |  |  |  |
Debt Issuance Costs, Net |  |  |  |  |  |  | $ 1,000 |  | $ 1,000 |  |  |  |  |  |  |  |  |  |
Third Eye Capital [Member] | Revolving Credit Facility [Member] | Prime Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  | 22.25% |  | 22.25% |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  | 13.75% |  |  |  |  |  |  |  |  |  |  |  |  |
Third Eye Capital [Member] | Acquisition Term Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  | $ 15,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Third Eye Capital [Member] | Revolving Notes Series B [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  | $ 58,500 |  | $ 58,500 |  |  |  |  |  |  |  |  |  |
Debt Issuance Costs, Net |  |  |  |  |  |  | $ 800 |  | $ 800 |  |  |  |  |  |  |  |  |  |
Third Eye Capital [Member] | Revolving Notes Series B [Member] | Prime Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  | 22.25% |  | 22.25% |  |  |  |  |  |  |  |  |  |
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% |  | 5.00% |  |  |  |  |  |  |  |  |  |
Revenue Participation Term Notes [Member] | Third Eye Capital [Member] | AAFK [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  | $ 12,200 |  | $ 12,200 |  |  |  |  |  |  |  |  |  |
Debt Issuance Costs, Net |  |  |  |  |  |  | 168 |  | 168 |  |  |  |  |  |  |  |  |  |
Amendment No 28 [Member] | Third Eye Capital [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Fee Amount |  |  |  |  |  |  |  |  |  | $ 100 |  |  |  |  |  |  |  |  |
Term Notes [Member] | Third Eye Capital [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  | 7,300 |  | 7,300 |  |  |  |  |  |  |  |  |  |
Debt Issuance Costs, Net |  |  |  |  |  |  | $ 104 |  | $ 104 |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  | 14.00% |  | 14.00% |  |  |  |  |  |  |  |  |  |
Acquisition Term Notes [Member] | Third Eye Capital [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  | $ 27,000 |  | $ 27,000 |  |  |  |  |  |  |  |  |  |
Debt Issuance Costs, Net |  |  |  |  |  |  | 325 |  | 325 |  |  |  |  |  |  |  |  |  |
Acquisition Term Notes [Member] | Third Eye Capital [Member] | Aemetis Facility Keyes, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Fee |  |  |  |  |  |  | $ 7,500 |  | $ 7,500 |  |  |  |  |  |  |  |  |  |
Acquisition Term Notes [Member] | Third Eye Capital [Member] | Prime Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  | 19.25% |  | 19.25% |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  | 10.75% |  |  |  |  |  |  |  |  |  |  |  |  |
Reserve Liquidity Facility [Member] | Third Eye Capital [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 18,000 |  |  |
Long-Term Debt |  |  |  |  |  |  | $ 0 |  | $ 0 |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 85,000 |  |  |
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 |  |  |
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 Issuance Costs, Net |  |  |  |  |  |  | 1,800 |  | 1,800 |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-Term Debt |  |  |  |  |  |  | 35,100 |  | 35,100 |  |  |  |  |  |  |  |  |  |
Fuels Revolving Line [Member] | Prime Rate [Member] | GAFI [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  | 6.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carbon Revolving Line [Member] | ACCI [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  | 23,400 |  | 23,400 |  |  |  |  |  |  |  |  |  |
Debt Issuance Costs, Net |  |  |  |  |  |  | 1,500 |  | 1,500 |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 8.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-Term Debt |  |  |  |  |  |  | 300 |  | 300 |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  | 7,000 |  | 7,000 |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 3.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, Long-Term and Short-Term, Combined Amount |  |  |  |  |  |  | 7,081 |  | 7,081 |  |  | 7,028 |  |  |  |  |  |  |
Subordinated Notes [Member] | AAFK [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Fee Amount |  |  |  |  |  |  |  |  |  |  | $ 340 |  |  |  |  |  |  | $ 3,400 |
Short-Term Debt |  |  |  |  |  |  | 17,700 |  | 17,700 |  |  | 17,600 |  |  |  |  |  |  |
Debt Instrument Fee Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% |
Debt Extension Fee, Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% |
EB5 Phase I Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500
Long-Term Debt |  |  |  |  |  |  | 38,000 |  | 38,000 |  |  | 37,900 |  |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Price (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 30 |  |
Debt Instrument, Amount Released From Escrow |  |  |  |  |  |  | 35,500 |  | 35,500 |  |  |  |  |  |  |  |  |  |
Debt Instrument, Amount Remaining Funded to Escrow |  |  |  |  |  |  | 500 |  | 500 |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  |  |  |  |  |  |  |  | 4,000 |  |  |  |  |  |  |  |  |  |
EB5 Phase I Notes [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Additional Investment Available to Issue |  |  |  |  |  |  | 200,000 |  | 200,000 |  |  |  |  |  |  |  |  |  |
EB5 Phase I Notes [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Investment Raised Per Investor |  |  |  |  |  |  |  | $ 800 |  |  |  |  |  |  | $ 500 |  |  |  |
EB5 Phase I Funding [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 36,000
EB5 Phase II Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, Long-Term and Short-Term, Combined Amount |  |  |  |  |  |  | 4,400 |  | 4,400 |  |  | 4,300 |  |  |  |  |  |  |
Secunderabad Oils [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 18.00% |  |  |  |  |
Short-Term Debt |  |  |  |  |  |  | 4,000 |  | 4,000 |  |  | 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 |  |  |  |  |  |  | 25,300 |  | 25,300 |  |  | 25,100 |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 9.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-Term Debt |  |  |  |  |  |  | 43,894 |  | 43,894 |  |  | 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 |  |  |  |  |  |  | 19,400 |  | 19,400 |  |  | $ 16,800 |  |  |  |  |  |  |
Debt Issuance Costs, Net |  |  |  |  |  |  | 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% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Agreement For Capital Expenditures [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  | 5,700 |  | 5,700 |  |  |  |  |  |  |  |  |  |
Short-Term Debt |  |  |  |  |  |  | 2,200 |  | 2,200 |  |  |  |  |  |  |  |  |  |
Other Long-Term Debt, Noncurrent |  |  |  |  |  |  | $ 3,600 |  | $ 3,600 |  |  |  |  |  |  |  |  |  |

X
- Definition Number of warrants or rights issued during a period of time. + References No definition available. + Details
Name: | amtx_ClassOfWarrantOrRightIssued
Namespace Prefix: | amtx_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Represents amount released from Escrow under debt instrument. + References No definition available. + Details
Name: | amtx_DebtInstrumentAmountReleasedFromEscrow
Namespace Prefix: | amtx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents amount remaining funded to escrow under debt instrument. + References No definition available. + Details
Name: | amtx_DebtInstrumentAmountRemainingFundedToEscrow
Namespace Prefix: | amtx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents extended fee rate added to balance outstanding under debt instrument. + References No definition available. + Details
Name: | amtx_DebtInstrumentExtendedFeeRateAddedToBalanceOutstanding
Namespace Prefix: | amtx_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents investment raised per investor under debt instrument. + References No definition available. + Details
Name: | amtx_DebtInstrumentInvestmentRaisedPerInvestor
Namespace Prefix: | amtx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents non-refundable one-time Fees of debt instrument. + References No definition available. + Details
Name: | amtx_DebtInstrumentNonRefundableOneTimeFees
Namespace Prefix: | amtx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents non-refundable standby fee of debt instrument as a percentage of difference between principal amount outstanding and the commitment. + References No definition available. + Details
Name: | amtx_DebtInstrumentNonrefundableStandbyFeePercentOfDifferenceBetweenPrincipalAmountAndTheCommitment
Namespace Prefix: | amtx_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents redemption fee under debt instrument agreement. + References No definition available. + Details
Name: | amtx_DebtInstrumentRedemptionFee
Namespace Prefix: | amtx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-3 + Details
Name: | us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
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