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6. Commitments and Contingencies (Details Narrative) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Commitments And Contingencies Details Narrative |  |  |
Rent expense | $ 426 us-gaap_LeaseAndRentalExpense | $ 386 us-gaap_LeaseAndRentalExpense | $ 220 us-gaap_LeaseAndRentalExpense
Rent reimbursement | $ 124 AMTX_RentReimbursement | $ 80 AMTX_RentReimbursement |

X
- Details
Name: | AMTX_Disclosure5.OperatingLeasesDetailsNarrativeAbstract
Namespace Prefix: | AMTX_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Custom Element. + References No definition available. + Details
Name: | AMTX_RentReimbursement
Namespace Prefix: | AMTX_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
Name: | us-gaap_LeaseAndRentalExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration