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10. Fair Value Measurements (Details) (USD $) | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Warranty liability | $ 59,593 | $ 267,950
Level 1 |  |
Warranty liability | 0 | 0
Level 2 |  |
Warranty liability | 0 | 0
Level 3 |  |
Warranty liability | $ 59,593 | $ 267,950

X
- Definition No authoritative reference available. + References No definition available. + Details
Name: | AMTX_WarrantyLiability
Namespace Prefix: | AMTX_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant