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5. Notes Payable (Details Narrative) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Interest payments	$ 141us-gaap_InterestPaid	$ 2,646us-gaap_InterestPaid
Third Eye Capital Term Notes
Principal and interest outstanding	7,300AMTX_PrincipalAndInterestOutstanding / us-gaap_DebtInstrumentAxis = AMTX_DebtInstrument1Member
Unamortized discount	200us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = AMTX_DebtInstrument1Member
Third Eye Capital Revolving Credit Facility
Principal and interest outstanding	21,300AMTX_PrincipalAndInterestOutstanding / us-gaap_DebtInstrumentAxis = AMTX_DebtInstrument2Member
Unamortized debt issuance costs	700us-gaap_UnamortizedDebtIssuanceExpense / us-gaap_DebtInstrumentAxis = AMTX_DebtInstrument2Member
Third Eye Capital Revenue Participation Term Notes
Principal and interest outstanding	10,100AMTX_PrincipalAndInterestOutstanding / us-gaap_DebtInstrumentAxis = AMTX_DebtInstrument3Member
Unamortized discount	300us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = AMTX_DebtInstrument3Member
Third Eye Capital Acquisition Term Notes
Principal and interest outstanding	17,500AMTX_PrincipalAndInterestOutstanding / us-gaap_DebtInstrumentAxis = AMTX_DebtInstrument4Member
Unamortized discount	500us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = AMTX_DebtInstrument4Member
Cilion shareholder Seller note payable
Principal and interest outstanding	5,400AMTX_PrincipalAndInterestOutstanding / us-gaap_DebtInstrumentAxis = AMTX_DebtInstrument5Member
State Bank of India secured term loan
Principal and interest outstanding	3,600AMTX_PrincipalAndInterestOutstanding / us-gaap_DebtInstrumentAxis = AMTX_DebtInstrument6Member		3,400AMTX_PrincipalAndInterestOutstanding / us-gaap_DebtInstrumentAxis = AMTX_DebtInstrument6Member
Outstanding debt	2,700us-gaap_UnsecuredDebt / us-gaap_DebtInstrumentAxis = AMTX_DebtInstrument6Member		2,600us-gaap_UnsecuredDebt / us-gaap_DebtInstrumentAxis = AMTX_DebtInstrument6Member
Subordinated Notes
Principal and interest outstanding	5,300AMTX_PrincipalAndInterestOutstanding / us-gaap_DebtInstrumentAxis = AMTX_DebtInstrument7Member		5,400AMTX_PrincipalAndInterestOutstanding / us-gaap_DebtInstrumentAxis = AMTX_DebtInstrument7Member
Unamortized discount	600us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = AMTX_DebtInstrument7Member		200us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = AMTX_DebtInstrument7Member
EB-5 long-term promissory notes
Outstanding accrued interest	75AMTX_OutstandingAccruedInterest / us-gaap_DebtInstrumentAxis = AMTX_DebtInstrument8Member
Unsecured working capital loans
Principal payments made	7,000us-gaap_RepaymentsOfNotesPayable / us-gaap_DebtInstrumentAxis = AMTX_DebtInstrument9Member	1,500us-gaap_RepaymentsOfNotesPayable / us-gaap_DebtInstrumentAxis = AMTX_DebtInstrument9Member
Interest payments	37us-gaap_InterestPaid / us-gaap_DebtInstrumentAxis = AMTX_DebtInstrument9Member	51us-gaap_InterestPaid / us-gaap_DebtInstrumentAxis = AMTX_DebtInstrument9Member
Outstanding debt	$ 7,000us-gaap_UnsecuredDebt / us-gaap_DebtInstrumentAxis = AMTX_DebtInstrument9Member	$ 1,300us-gaap_UnsecuredDebt / us-gaap_DebtInstrumentAxis = AMTX_DebtInstrument9Member

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