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Note 12 - Subsequent Events (Details Textual) - Third Eye Capital [Member] - Amendment No. 26 [Member] - Subsequent Event [Member] GT in Millions, $ in Millions | May 04, 2023 USD ($) GT
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Debt Instrument, Minimum Production Requirement (Gigaton) | GT | 10
Debt Instrument, Fee Amount | $ | $ 0.1

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- Definition Represents minimum production requirement for debt instrument. + References No definition available. + Details
Name: | amtx_DebtInstrumentMinimumProductionRequirement
Namespace Prefix: | amtx_
Data Type: | dtr-types:massItemType
Balance Type: | na
Period Type: | instant

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- Definition Amount of the fee that accompanies borrowing money under the debt instrument. + 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 210.5-02.22(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_DebtInstrumentFeeAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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_AmendmentNo26Member
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: |