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Note 12 - Subsequent Events (Details Textual) - Subsequent Event [Member] - USD ($)	Nov. 08, 2023	Oct. 16, 2023	Oct. 06, 2023
Proceeds From Sale of Investment Tax Credits			$ 55,200,000
PUPA Fourth Amendment [Member]
Preferred Units Issued Value	$ 102,500,000
Closing Fee	$ 5,500,000
Series A Preferred Stock [Member] | Series A Preferred Unit Purchase Agreement [Member]
Payments for Repurchase of Preferred Units		$ 30,000,000
Revolving Credit Facility [Member]
Repayments of Long-Term Debt		8,600,000
Third Eye Capital [Member]
Repayments of Long-Term Debt		50,200,000
Third Eye Capital [Member] | Fuels Revolving Line [Member] | GAFI [Member]
Repayments of Long-Term Debt		11,600,000
Third Eye Capital [Member] | GAFI Revolving Loan [Member]
Line of Credit Facility, Current Borrowing Capacity		37,500,000
Third Eye Capital [Member] | Revolving Credit Facility [Member]
Repayments of Long-Term Debt		$ 8,600,000

X

- Definition

Amount of closing fee.

+ References

No definition available.

+ Details

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Namespace Prefix:	amtx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of cash outflow for the repurchase of preferred units

+ References

No definition available.

+ Details

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

X

- Definition

Represents preferred units issued value.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of cash inflow from sale of investment tax credits.

+ References

No definition available.

+ Details

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Namespace Prefix:	amtx_
Data Type:	xbrli:monetaryItemType
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X

- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ 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 210.5-02.19(b),22(b))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

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X

- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 3
-Subparagraph (SX 210.6-03(i)(2))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479886/946-10-S99-3

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-15

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