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Note 12 - Subsequent Events (Details Textual) - Subsequent Event [Member] - Construction Loan Agreement [Member] $ in Millions | Oct. 04, 2022 USD ($)
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Debt Agreement, Maximum Borrowing Capacity | $ 25
Debt Instrument, Interest Rate, Stated Percentage | 5.95%
Usda Annual Renewal Fee | 0.25%

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- 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

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- Definition Represents the USDA annual renewal fee. + References No definition available. + Details
Name: | amtx_UsdaAnnualRenewalFee
Namespace Prefix: | amtx_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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

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