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Agreements (Details Narrative) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Ethanol sales | $ 0 | $ 1,666,000 | $ 0 | $ 26,049,000
J.D. Heiskell [Member] |  |  |  |
Marketing costs | 700,000 | 500,000 | 1,400,000 | 1,100,000
Ethanol sales | $ 0 | $ 1,700,000 | $ 0 | $ 26,000,000.0

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- Definition Proceeds from borrowing under secured debt facilities + References No definition available. + Details
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Namespace Prefix: | amtx_
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Balance Type: | debit
Period Type: | duration

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- 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 -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |