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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	$ 60AMTX_BalanceAsOfDecember312012	$ 268AMTX_BalanceAsOfDecember312012
Issuances of warrant liabilities		996AMTX_IssuancesOfWarrantLiabilities
Exercise of warrant liabilities		(1,007)AMTX_ExerciseOfWarrantLiabilities
Related change in fair value	48AMTX_RealizedAndUnrealizedGainRelatedToChangeInFairValue	(197)AMTX_RealizedAndUnrealizedGainRelatedToChangeInFairValue
Ending Balance	$ 108AMTX_BalanceAsOfMarch312013	$ 60AMTX_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