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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