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11. Agreements (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Agreements Details |  |  |  |
Ethanol sales | $ 40,799 | $ 27,243 | $ 87,747 | $ 32,740
Wet distiller's grains sales | 11,708 | 6,322 | 21,423 | 8,006
Corn oil sales | 1,344 | 455 | 2,245 | 630
Corn purchases | 33,619 | 26,145 | 66,947 | 31,519
Milo purchases | 0 | 4,648 | 0 | 4,648
Accounts receivable | 458 | 1,578 | 458 | 1,578
Accounts payable | $ 2,122 | $ 2,096 | $ 2,122 | $ 2,096

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 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