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Note 5 - Commitments and Contingencies (Details Textual)	6 Months Ended
	Jun. 30, 2023
Minimum [Member]
Lease Term (Year)	2 years
Maximum [Member]
Lease Term (Year)	14 years

X

- Definition

Represents lease term.

+ References

No definition available.

+ Details

Name:	amtx_LeaseTerm
Namespace Prefix:	amtx_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: