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Note 14 - Related Party Transactions (Details Textual) $ in Millions | 9 Months Ended
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Sep. 30, 2025 USD ($)
Employment Agreements and Expense Reimbursements [Member] | Mr. McAfee [Member] |
Related Party Transaction, Amounts of Transaction | $ 1.3

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- Definition Amount of transactions with related party during the financial reporting period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 850 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483326/850-10-50-1 + Details
Name: | us-gaap_RelatedPartyTransactionAmountsOfTransaction
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_RelatedPartyTransactionAxis=amtx_EmploymentAgreementsAndExpenseReimbursementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=amtx_MrMcafeeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |