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9. Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2014
--- | ---
Warranty liability | $ 179
Level 1 |
Warranty liability | 0
Level 2 |
Warranty liability | 0
Level 3 |
Warranty liability | $ 179

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