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5. Notes Payable (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Total revenues    
Third Eye Capital term note $ 7,394AMTX_ThirdEyeCapitalExistingTermNote $ 7,193AMTX_ThirdEyeCapitalExistingTermNote
Third Eye Capital revolving credit facility 22,330AMTX_ThirdEyeCapitalRevolvingCreditFacility 38,349AMTX_ThirdEyeCapitalRevolvingCreditFacility
Third Eye Capital revenue participation term note 10,195AMTX_ThirdEyeCapitalRevenueParticipationConvertedToTermNote 9,465AMTX_ThirdEyeCapitalRevenueParticipationConvertedToTermNote
Third Eye Capital acquisition term note 17,728AMTX_ThirdEyeCapitalAcquisitionTermNote 17,280AMTX_ThirdEyeCapitalAcquisitionTermNote
Cilion shareholder Seller note payable 5,373us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt 4,869us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt
State Bank of India secured term loan 6,032AMTX_StateBankOfIndiaSecuredTermLoan 5,857AMTX_StateBankOfIndiaSecuredTermLoan
Subordinated notes 5,428us-gaap_SubordinatedDebt 5,317us-gaap_SubordinatedDebt
EB-5 long term promissory notes 1,534AMTX_Eb5LongTermPromissoryNotes 1,037AMTX_Eb5LongTermPromissoryNotes
Unsecured working capital loans and short-term notes 1,287us-gaap_UnsecuredDebtCurrent 2,391us-gaap_UnsecuredDebtCurrent
Total debt 77,301AMTX_TotalDebt 91,758AMTX_TotalDebt
Less current portion of debt 12,746us-gaap_DebtCurrent 17,966us-gaap_DebtCurrent
Total long term debt $ 64,832us-gaap_LongTermDebt $ 73,792us-gaap_LongTermDebt