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

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