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12. Segment Information (Details 1) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Segment Information Details 1 |  |
North America | $ 79,987AMTX_NorthAmericaUnitedStates | $ 76,066AMTX_NorthAmericaUnitedStates
India | 13,327AMTX_India3 | 13,110AMTX_India3
Total Assets | $ 93,314AMTX_TotalAssets | $ 89,176AMTX_TotalAssets

X
- Details
Name: | AMTX_Disclosure8.SegmentInformationDetails1Abstract
Namespace Prefix: | AMTX_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Total revenues + References No definition available. + Details
Name: | AMTX_India3
Namespace Prefix: | AMTX_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition North America (United States) + References No definition available. + Details
Name: | AMTX_NorthAmericaUnitedStates
Namespace Prefix: | AMTX_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Total Assets + References No definition available. + Details
Name: | AMTX_TotalAssets
Namespace Prefix: | AMTX_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant