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9. Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014
Warranty liability	$ 108
Level 1
Warranty liability
Level 2
Warranty liability
Level 3
Warranty liability	$ 108

X

- Definition

Custom Element.

+ References

No definition available.

+ Details

Name:	AMTX_WarrantyLiability
Namespace Prefix:	AMTX_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant