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5. Notes Payable (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Total revenues |  |
Third Eye Capital term note | $ 7,300AMTX_ThirdEyeCapitalExistingTermNote | $ 7,394AMTX_ThirdEyeCapitalExistingTermNote
Third Eye Capital revolving credit facility | 21,267AMTX_ThirdEyeCapitalRevolvingCreditFacility | 22,330AMTX_ThirdEyeCapitalRevolvingCreditFacility
Third Eye Capital revenue participation term note | 10,065AMTX_ThirdEyeCapitalRevenueParticipationConvertedToTermNote | 10,195AMTX_ThirdEyeCapitalRevenueParticipationConvertedToTermNote
Third Eye Capital acquisition term note | 17,525AMTX_ThirdEyeCapitalAcquisitionTermNote | 17,728AMTX_ThirdEyeCapitalAcquisitionTermNote
Cilion shareholder Seller note payable | 5,410us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt | 5,373us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt
State Bank of India secured term loan | 6,318AMTX_StateBankOfIndiaSecuredTermLoan | 6,032AMTX_StateBankOfIndiaSecuredTermLoan
Subordinated notes | 5,282us-gaap_SubordinatedDebt | 5,428us-gaap_SubordinatedDebt
EB-5 long term promissory notes | 19,075AMTX_Eb5LongTermPromissoryNotes | 1,534AMTX_Eb5LongTermPromissoryNotes
Unsecured working capital loans and short-term notes | 656us-gaap_UnsecuredDebtCurrent | 1,287us-gaap_UnsecuredDebtCurrent
Total debt | 92,898AMTX_TotalDebt | 77,301AMTX_TotalDebt
Less current portion of debt | 12,138us-gaap_DebtCurrent | 12,746us-gaap_DebtCurrent
Total long term debt | $ 80,760us-gaap_LongTermDebtNoncurrent | $ 64,555us-gaap_LongTermDebtNoncurrent

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