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11. Agreements (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Agreements |  |
Ethanol sales | $ 113,855 | $ 106,419
Wet distiller's grains sales | 32,362 | 26,422
Corn oil sales | 3,393 | 3,707
Corn purchases | 112,687 | 101,768
Accounts receivable | 433 | 1,171
Accounts payable | $ 1,882 | $ 2,449

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- Definition Custom Element. + References No definition available. + Details
Name: | AMTX_AccountsPayable
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
Name: | AMTX_AgreementsAbstract
Namespace Prefix: | AMTX_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | AMTX_CornAndMiloPurchases
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
Period Type: | duration

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- Definition Wet distiller's grains sales + References No definition available. + Details
Name: | AMTX_WetDistillersGrainsSales
Namespace Prefix: | AMTX_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration