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Note 12 - Agreements (Details Textual) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025 USD ($) $ / MMBTU	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($) MMBTU $ / MMBTU	Sep. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)	Jul. 01, 2022 USD ($)
Marketing Expense	$ 600	$ 700	$ 1,800	$ 1,900
Shipping and Handling Costs	1,200	1,100	3,500	2,600
Oil and Gas, Result of Operation, Transportation Cost	$ 1,400	$ 1,500	$ 4,100	$ 4,400
Natural Gas and Natural Gas Liquids (NGL) [Member] | Long [Member]
Forward Purchase Agreement, Fixed Price, Energy Measure (Millions of British Thermal Unit) | MMBTU			3,700
Forward Purchase Agreement, Fixed Price (in USD per Millions of British Thermal Unit) | $ / MMBTU	3.3		3.3
Forward Sales Commitments [Member]
Other Commitment	$ 0		$ 0
Operating Agreement with Gemini Edibles and Fats India Private Limited [Member]
Debt Agreement, Maximum Borrowing Capacity						$ 12,700
Debt Instrument, Interest Rate, Stated Percentage						18.00%
Accounts Payable	$ 0		$ 0		$ 6,200

X

- Definition

Represents maximum borrowing capacity under debt agreement.

+ References

No definition available.

+ Details

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Namespace Prefix:	amtx_
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Balance Type:	credit
Period Type:	instant

X

- Definition

The fixed price related to the forward purchase agreement.

+ References

No definition available.

+ Details

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Namespace Prefix:	amtx_
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Balance Type:	na
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X

- Definition

Nominal energy measure used to calculate payments on the forward purchase agreement at a fixed price.

+ References

No definition available.

+ Details

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Namespace Prefix:	amtx_
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Balance Type:	na
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X

- Definition

Amount of costs related to shipping and handling.

+ References

No definition available.

+ Details

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X

- Definition

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(15)(5))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

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)(15)(a))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1

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X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22)(a)(1))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1B

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X

- Definition

Expenditures for planning and executing the conception, pricing, promotion, and distribution of ideas, goods, and services. Costs of public relations and corporate promotions are typically considered to be marketing costs.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(4))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2

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X

- Definition

Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 942
-SubTopic 235
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477314/942-235-S99-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 4
-Publisher FASB
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Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
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-SubTopic 10
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-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-04(a))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-3

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X

- Definition

Amount of transportation cost charged to expense in oil- and gas-producing activities.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 932
-SubTopic 235
-Name Accounting Standards Codification
-Section 50
-Paragraph 28
-Subparagraph (b)
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 932
-SubTopic 280
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Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
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- Details

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