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10. Fair Value Measurements (Details 1) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013
Fair Value Measurements Details 1 |  |
Beginning Balance | $ 60 AMTX_BalanceAsOfDecember312012 | $ 268 AMTX_BalanceAsOfDecember312012
Issuances of warrant liabilities |  | 996 AMTX_IssuancesOfWarrantLiabilities
Exercise of warrant liabilities |  | (1,007)AMTX_ExerciseOfWarrantLiabilities
Related change in fair value | 48 AMTX_RealizedAndUnrealizedGainRelatedToChangeInFairValue | (197)AMTX_RealizedAndUnrealizedGainRelatedToChangeInFairValue
Ending Balance | $ 108 AMTX_BalanceAsOfMarch312013 | $ 60 AMTX_BalanceAsOfMarch312013

X
- Definition India + References No definition available. + Details
Name: | AMTX_BalanceAsOfDecember312012
Namespace Prefix: | AMTX_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition India1 + References No definition available. + Details
Name: | AMTX_BalanceAsOfMarch312013
Namespace Prefix: | AMTX_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Proceeds from sale of land + References No definition available. + Details
Name: | AMTX_ExerciseOfWarrantLiabilities
Namespace Prefix: | AMTX_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | AMTX_FairValueMeasurementsDetails1Abstract
Namespace Prefix: | AMTX_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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