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9. Agreements (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Commitments and Contingencies Disclosure [Abstract] |  |  |  |
Ethanol sales | $ 27,456 | $ 29,661 | $ 84,453 | $ 88,002
Wet distiller's grains sales | 8,783 | 8,116 | 26,119 | 24,443
Corn oil sales | 934 | 714 | 2,586 | 2,530
Corn/milo purchases | 30,446 | 27,786 | 90,426 | 84,291
Accounts receivable | 1,066 | 1,079 | 1,066 | 1,079
Accounts payable | $ 2,484 | $ 2,416 | $ 2,484 | $ 2,416

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- Definition Custom Element. + References No definition available. + Details
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Namespace Prefix: | AMTX_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Accrued interest expense + References No definition available. + Details
Name: | AMTX_AccountsReceivable
Namespace Prefix: | AMTX_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | AMTX_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition North America (United States) + References No definition available. + Details
Name: | AMTX_CornOilSales
Namespace Prefix: | AMTX_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Proceeds from borrowing under secured debt facilities + References No definition available. + Details
Name: | AMTX_EthanolSales
Namespace Prefix: | AMTX_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Wet distiller's grains sales + References No definition available. + Details
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Namespace Prefix: | AMTX_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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