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9. Fair Value Measurements (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Fair Value Measurements Details 1
Balance as of December 31, 2013	$ 60
Issuances of warrant liabilities
Exercise of warrant liabilities
Related change in fair value	48
Balance as of March 31, 2014	$ 108

X

- Definition

India

+ References

No definition available.

+ Details

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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

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- Details

Name:	AMTX_FairValueMeasurementsDetails1Abstract
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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Custom Element.

+ References

No definition available.

+ Details

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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
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