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

X

- 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

X

- Details

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

X

- Details

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