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Note 8 - Outstanding Warrants - Schedule of Warrants or Rights (Details) - $ / shares shares in Thousands	3 Months Ended
	Mar. 31, 2023	Dec. 31, 2022
Outstanding, warrants (in shares)	355
Outstanding, Weighted - Average Exercise Price (in dollars per share)	$ 15.92
Outstanding, Average Remaining Term in Years (Year)	7 years 2 months 26 days	7 years 5 months 23 days
Granted, warrants (in shares)	113
Granted, Weighted - Average Exercise Price (in dollars per share)	$ 0.01
Exercised, warrants (in shares)	(113)
Exercised, Weighted - Average Exercise Price (in dollars per share)	$ 0.01
Outstanding, warrants (in shares)	355
Outstanding, Weighted - Average Exercise Price (in dollars per share)	$ 15.92

X

- Definition

The number of warrants or rights exercised during period.

+ References

No definition available.

+ Details

Name:	amtx_ClassOfWarrantOrRightExercisedDuringPeriod
Namespace Prefix:	amtx_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Exercise price per share of warrants or rights exercised during period.

+ References

No definition available.

+ Details

Name:	amtx_ClassOfWarrantOrRightExercisedDuringPeriodExercisePrice
Namespace Prefix:	amtx_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The number of warrants or rights granted during period.

+ References

No definition available.

+ Details

Name:	amtx_ClassOfWarrantOrRightGrantedDuringPeriod
Namespace Prefix:	amtx_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Exercise price per share of warrants or rights granted during period.

+ References

No definition available.

+ Details

Name:	amtx_ClassOfWarrantOrRightGrantedDuringPeriodExercisePrice
Namespace Prefix:	amtx_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481112/505-10-50-3

+ Details

Name:	us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Number of warrants or rights outstanding.

+ References

No definition available.

+ Details

Name:	us-gaap_ClassOfWarrantOrRightOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Period between issuance and expiration of outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

+ Details

Name:	us-gaap_WarrantsAndRightsOutstandingTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant