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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)	$ 76,066AMTX_NorthAmericaUnitedStates	$ 83,183AMTX_NorthAmericaUnitedStates
India	13,110AMTX_India3	13,959AMTX_India3
Total Assets	$ 89,176AMTX_TotalAssets	$ 97,142AMTX_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