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13. Segment Information (Details 1) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Segment Information Details 1 |  |
North America (United States) | $ 76,066 AMTX_NorthAmericaUnitedStates | $ 83,183 AMTX_NorthAmericaUnitedStates
India | 13,110 AMTX_India3 | 13,959 AMTX_India3
Total Assets | $ 89,176 AMTX_TotalAssets | $ 97,142 AMTX_TotalAssets

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

X
- Definition Custom Element. + 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