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11. Agreements (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2015 | Mar. 31, 2014
Agreements Details |  |
Ethanol sales | $ 22,612AMTX_EthanolSales | $ 46,004AMTX_EthanolSales
Wet distiller's grains sales | 7,350AMTX_WetDistillersGrainsSales | 9,715AMTX_WetDistillersGrainsSales
Corn oil sales | 865AMTX_CornOilSales | 901AMTX_CornOilSales
Corn purchases | 25,959AMTX_CornPurchases | 33,328AMTX_CornPurchases
Accounts receivable | 333AMTX_AccountsReceivable | 826AMTX_AccountsReceivable
Accounts payable | $ 1,743AMTX_AccountsPayable | $ 2,065AMTX_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

X
- 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 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