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Note 1 - General (Details Textual) $ in Millions	9 Months Ended
	Sep. 30, 2025 USD ($)
Tax Credit Income	$ 7

X

- Definition

Amount of tax credit income.

+ References

No definition available.

+ Details

Name:	amtx_TaxCreditIncome
Namespace Prefix:	amtx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration