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12. Segment Information (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2015 | Mar. 31, 2014
Revenues |  |
North America | $ 33,207AMTX_NorthAmerica | $ 59,081AMTX_NorthAmerica
India | 1,519AMTX_India | 1,584AMTX_India
Total revenues | 34,726AMTX_TotalRevenues | 60,665AMTX_TotalRevenues
Cost of goods sold |  |
North America | 33,369AMTX_NorthAmerica1 | 43,409AMTX_NorthAmerica1
India | 1,585AMTX_India1 | 1,632AMTX_India1
Total cost of goods sold | 34,954AMTX_TotalCostOfGoodsSold | 45,041AMTX_TotalCostOfGoodsSold
Gross profit (loss) |  |
North America | (162)AMTX_NorthAmerica2 | 15,672AMTX_NorthAmerica2
India | (66)AMTX_India2 | (48)AMTX_India2
Total gross profit (loss) | $ (228)AMTX_TotalGrossLoss | $ 15,624AMTX_TotalGrossLoss

X
- Details
Name: | AMTX_CostOfGoodsSoldAbstract1
Namespace Prefix: | AMTX_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | AMTX_GrossLossAbstract
Namespace Prefix: | AMTX_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition India + References No definition available. + Details
Name: | AMTX_India
Namespace Prefix: | AMTX_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition India1 + References No definition available. + Details
Name: | AMTX_India1
Namespace Prefix: | AMTX_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition India2 + References No definition available. + Details
Name: | AMTX_India2
Namespace Prefix: | AMTX_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition North America + References No definition available. + Details
Name: | AMTX_NorthAmerica
Namespace Prefix: | AMTX_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition NorthAmerica1 + References No definition available. + Details
Name: | AMTX_NorthAmerica1
Namespace Prefix: | AMTX_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition NorthAmerica2 + References No definition available. + Details
Name: | AMTX_NorthAmerica2
Namespace Prefix: | AMTX_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | AMTX_RevenuesAbstract1
Namespace Prefix: | AMTX_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Total cost of goods sold + References No definition available. + Details
Name: | AMTX_TotalCostOfGoodsSold
Namespace Prefix: | AMTX_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Total gross loss + References No definition available. + Details
Name: | AMTX_TotalGrossLoss
Namespace Prefix: | AMTX_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Total revenues + References No definition available. + Details
Name: | AMTX_TotalRevenues
Namespace Prefix: | AMTX_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration