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12. Agreements (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Agreements Details |  |  |
Ethanol sales | $ 148,408 AMTX_EthanolSales | $ 106,566 AMTX_EthanolSales | $ 128,831 AMTX_EthanolSales
Wet distiller's grains sales | 32,689 AMTX_WetDistillersGrainsSales | 26,490 AMTX_WetDistillersGrainsSales | 35,469 AMTX_WetDistillersGrainsSales
Corn oil sales | 4,501 AMTX_CornOilSales | 2,609 AMTX_CornOilSales | 2,583 AMTX_CornOilSales
Corn purchases | 120,915 AMTX_CornPurchases | 96,000 AMTX_CornPurchases | 156,985 AMTX_CornPurchases
Milo Purchases | 0 AMTX_MiloPurchases | 11,523 AMTX_MiloPurchases | 0 AMTX_MiloPurchases
Accounts receivable | 368 AMTX_AccountsReceivable | 641 AMTX_AccountsReceivable | 395 AMTX_AccountsReceivable
Accounts payable | $ 1,965 AMTX_AccountsPayable | $ 2,228 AMTX_AccountsPayable | $ 2,650 AMTX_AccountsPayable

X
- 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

X
- 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

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

X
- Details
Name: | AMTX_Disclosure7.AgreementsDetailsAbstract
Namespace Prefix: | AMTX_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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

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

X
- 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