XML 85 R69.htm IDEA: XBRL DOCUMENT v3.24.1

Note 11 - Segment Information (Details Textual) gal in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2023 gal	Dec. 31, 2022
Number of Reportable Segments		3
California Ethanol [Member]
GallonPerYear (Gallon)		65
California Ethanol [Member] | Customer Concentration Risk [Member] | Revenue, Segment Benchmark [Member] | Ethanol Sales [Member]
Number of Major Customers		1	1
California Ethanol [Member] | Customer Concentration Risk [Member] | Revenue, Segment Benchmark [Member] | Ethanol Sales [Member] | Customer One [Member]
Concentration Risk, Percentage		100.00%
California Ethanol [Member] | Customer Concentration Risk [Member] | Revenue, Segment Benchmark [Member] | Ethanol Sales, Wet Distillers Grain and Corn Oil Sales [Member]
Number of Major Customers			1
California Ethanol [Member] | Customer Concentration Risk [Member] | Revenue, Segment Benchmark [Member] | Ethanol Sales, Wet Distillers Grain and Corn Oil Sales [Member] | Customer One [Member]
Concentration Risk, Percentage			73.00%
California Ethanol [Member] | Customer Concentration Risk [Member] | Revenue, Segment Benchmark [Member] | Ethanol Sales, Wet Distillers Grain and Corn Oil Sales [Member] | Customer Two [Member]
Concentration Risk, Percentage			26.00%
India Biodiesel [Member]
GallonPerYear (Gallon)		60
India Biodiesel [Member] | Customer Concentration Risk [Member] | Revenue, Segment Benchmark [Member] | Biodiesel Sales [Member] | Customer One [Member]
Concentration Risk, Percentage		47.00%	48.00%
India Biodiesel [Member] | Customer Concentration Risk [Member] | Revenue, Segment Benchmark [Member] | Biodiesel Sales [Member] | Customer Two [Member]
Concentration Risk, Percentage		25.00%	29.00%
India Biodiesel [Member] | Customer Concentration Risk [Member] | Revenue, Segment Benchmark [Member] | Biodiesel Sales [Member] | Customer Three [Member]
Concentration Risk, Percentage		23.00%	12.00%
California Dairy Renewable Natural Gas [Member] | Customer Concentration Risk [Member] | Revenue, Segment Benchmark [Member] | Sales of Biogas [Member]
Number of Major Customers		1
California Dairy Renewable Natural Gas [Member] | Customer Concentration Risk [Member] | Revenue, Segment Benchmark [Member] | Sales of Biogas [Member] | Customer One [Member]
Concentration Risk, Percentage		100.00%
California Dairy Renewable Natural Gas [Member] | Customer Concentration Risk [Member] | Revenue, Segment Benchmark [Member] | D3 RIN Credits [Member]
Number of Major Customers	1
California Dairy Renewable Natural Gas [Member] | Customer Concentration Risk [Member] | Revenue, Segment Benchmark [Member] | D3 RIN Credits [Member] | Customer One [Member]
Concentration Risk, Percentage	98.00%

X

- Definition

Represents amount of gallon per year.

+ References

No definition available.

+ Details

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Namespace Prefix:	amtx_
Data Type:	dtr-types:volumeItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents number of major customers.

+ References

No definition available.

+ Details

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Namespace Prefix:	amtx_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-42

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482907/825-10-50-21

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482907/825-10-50-20

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482861/275-10-50-18

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482861/275-10-50-20

+ Details

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Balance Type:	na
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X

- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 18
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-18

+ Details

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Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
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X

- Details

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Balance Type:
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X

- Details

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Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=amtx_EthanolSalesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_MajorCustomersAxis=amtx_CustomerOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Data Type:	na
Balance Type:
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X

- Details

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- Details

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- Details

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- Details

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- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=amtx_CaliforniaDairyRenewableNaturalGasMember
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Balance Type:
Period Type:

X

- Details

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X

- Details

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