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Note 12 - Subsequent Events (Details Textual) - Third Eye Capital [Member] - Amendment No. 26 [Member] - Subsequent Event [Member] GT in Millions, $ in Millions	May 04, 2023 USD ($) GT
Debt Instrument, Minimum Production Requirement (Gigaton) | GT	10
Debt Instrument, Fee Amount | $	$ 0.1

X

- Definition

Represents minimum production requirement for debt instrument.

+ References

No definition available.

+ Details

Name:	amtx_DebtInstrumentMinimumProductionRequirement
Namespace Prefix:	amtx_
Data Type:	dtr-types:massItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Amount of the fee that accompanies borrowing money under the debt instrument.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(b))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

+ Details

Name:	us-gaap_DebtInstrumentFeeAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=amtx_ThirdEyeCapitalMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=amtx_AmendmentNo26Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: