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13. Acquisitions, Divestitures and Material Agreements (Details 1) (USD $) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011
Acquisitions Divestitures And Material Agreements Details 1 |  |
Ethanol sales | $ 128,830,630 | $ 105,447,012
Distillers grains sales | 35,468,559 | 20,558,034
Corn oil sales | 2,582,858 | 0
Total Sales | 166,882,047 | 126,005,046
Corn purchases | 156,984,918 | 106,194,420
Accounts receivable | $ 394,784 | $ 841,729

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- Definition AccountsReceivable + 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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- Details
Name: | AMTX_AgreementsDetailsAbstract
Namespace Prefix: | AMTX_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Other2 + References No definition available. + Details
Name: | AMTX_CornPurchases
Namespace Prefix: | AMTX_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Schedule of warrant activity + References No definition available. + Details
Name: | AMTX_EthanolSales
Namespace Prefix: | AMTX_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition No authoritative reference available. + References No definition available. + Details
Name: | AMTX_TotalSales
Namespace Prefix: | AMTX_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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