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Note 2 - Inventories (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Lower Cost Or Market Adjustment	$ 100	$ 0

X

- Definition

Represents lower cost or market adjustment.

+ References

No definition available.

+ Details

Name:	amtx_LowerCostOrMarketAdjustment
Namespace Prefix:	amtx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration