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Note 14 - Grants Received (Details Textual) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended	12 Months Ended
	May 31, 2022	Oct. 31, 2020	Jun. 30, 2022	Dec. 31, 2024	Dec. 31, 2019	Dec. 31, 2023	Jan. 01, 2023
Accounts Receivable, after Allowance for Credit Loss				$ 1,800		$ 8,600	$ 1,300
PG&E SEM Incentive Program [Member]
Awarded Grants				1,100
Proceeds from Grantors				504
PG&E SEM Incentive Program [Member] | Grant Receivable [Member]
Accounts Receivable, after Allowance for Credit Loss				131
U.S. Department of Food And Agriculture Forest Service [Member]
Awarded Grants				245
LCFPP [Member]
Awarded Grants				4,200
Proceeds from Grantors				3,800
CDFAs[Member]
Awarded Grants		$ 7,800			$ 3,200
Proceeds from Grantors				6,800
CEC [Member]
Matching Contribution					7,900
Actual Expenses Incurred					5,000
Unearned Grant Proceeds				1,700
CEC [Member] | Maximum [Member]
Awarded Grants					$ 5,000
California Energy Commission Grant for Solar Microgrid, DSC and Battery Backup System [Member]
Awarded Grants				8,000
Proceeds from Grantors				5,900
Matching Contribution				1,600
CAL FIRE Business and Workforce Development Grant Program [Member]
Awarded Grants	$ 2,000
Proceeds from Grantors				0
Matching Contribution	5,800
CAL Fire [Member]
Awarded Grants	500
Proceeds from Grantors				0
US Forest Service [Member]
Awarded Grants	642
USDA Bioguel Producer Program [Member]
Proceeds from Grantors			$ 14,200
Matching Contribution	$ 2,400
California Energy Commission Grant for Mechanical Vapor Recompression System [Member]
Awarded Grants				6,000
Proceeds from Grantors				3,900
Matching Contribution				$ 5,300

X

- Definition

Represents actual expenses incurred.

+ References

No definition available.

+ Details

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

X

- Definition

Represents awarded grants.

+ References

No definition available.

+ Details

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

X

- Definition

Represents matching contribution.

+ References

No definition available.

+ Details

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

X

- Definition

Represents unearned grant proceeds.

+ References

No definition available.

+ Details

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

X

- Definition

Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 946
-SubTopic 310
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477802/946-310-45-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(5))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-04(5)(b))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479170/946-210-S99-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 954
-SubTopic 310
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479196/954-310-45-1

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(3))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1

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

X

- Definition

Cash received from grantors during the current period related to operating activities. This element represents receipts from a guarantor for the amount of guarantee provided.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 25
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-25

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Period Type:	duration

X

- Details

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X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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X

- Details

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X

- Details

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X

- Details

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- Details

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Namespace Prefix:
Data Type:	na
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X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_GovernmentAssistanceTypeAxis=amtx_CalFireMember
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X

- Details

Name:	us-gaap_GovernmentAssistanceTypeAxis=amtx_UsForestServiceMember
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X

- Details

Name:	us-gaap_GovernmentAssistanceTypeAxis=amtx_UsdaBioguelProducerProgramMember
Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Period Type: