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Note 16 - Liquidity (Details Textual) - Third Eye Capital [Member] - Reserve Liquidity Facility [Member] - USD ($) $ in Millions | Mar. 25, 2024 | Mar. 22, 2024 | Mar. 14, 2021
--- | --- | --- | ---
Line of Credit Facility, Maximum Borrowing Capacity |  |  | $ 70
Subsequent Event [Member] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 85 | $ 85 |

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_LineOfCreditFacilityAxis=amtx_ThirdEyeCapitalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DebtInstrumentAxis=amtx_ReserveLiquidityFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |