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5. Notes Payable (Details Narrative) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Debt obligation	$ 6,714us-gaap_ShortTermBorrowings	$ 7,709us-gaap_ShortTermBorrowings
Other current liabilities	3,590us-gaap_OtherLiabilitiesCurrent	6,245us-gaap_OtherLiabilitiesCurrent
Third Eye Capital Term Notes
Proceeds from notes payable	2,000us-gaap_ProceedsFromNotesPayable / us-gaap_DebtInstrumentAxis = AMTX_DebtInstrument1Member
Principal and interest outstanding	7,400AMTX_PrincipalAndInterestOutstanding / us-gaap_DebtInstrumentAxis = AMTX_DebtInstrument1Member
Unamortized discount	138us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = AMTX_DebtInstrument1Member
Third Eye Capital Revolving Credit Facility
Principal and interest outstanding	22,300AMTX_PrincipalAndInterestOutstanding / us-gaap_DebtInstrumentAxis = AMTX_DebtInstrument2Member
Unamortized debt issuance costs	447us-gaap_UnamortizedDebtIssuanceExpense / us-gaap_DebtInstrumentAxis = AMTX_DebtInstrument2Member
Third Eye Capital Revenue Participation Term Notes
Principal and interest outstanding	10,200AMTX_PrincipalAndInterestOutstanding / us-gaap_DebtInstrumentAxis = AMTX_DebtInstrument3Member
Unamortized discount	190us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = AMTX_DebtInstrument3Member
Third Eye Capital Acquisition Term Notes
Principal and interest outstanding	17,700AMTX_PrincipalAndInterestOutstanding / us-gaap_DebtInstrumentAxis = AMTX_DebtInstrument4Member
Unamortized discount	302us-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	3,400AMTX_PrincipalAndInterestOutstanding / us-gaap_DebtInstrumentAxis = AMTX_DebtInstrument6Member	2,700AMTX_PrincipalAndInterestOutstanding / us-gaap_DebtInstrumentAxis = AMTX_DebtInstrument6Member
Outstanding debt	2,600us-gaap_UnsecuredDebt / us-gaap_DebtInstrumentAxis = AMTX_DebtInstrument6Member	3,200us-gaap_UnsecuredDebt / us-gaap_DebtInstrumentAxis = AMTX_DebtInstrument6Member
Subordinated Notes
Principal and interest outstanding	5,400AMTX_PrincipalAndInterestOutstanding / us-gaap_DebtInstrumentAxis = AMTX_DebtInstrument7Member	5,300AMTX_PrincipalAndInterestOutstanding / us-gaap_DebtInstrumentAxis = AMTX_DebtInstrument7Member
Unamortized discount	0us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = AMTX_DebtInstrument7Member	300us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = AMTX_DebtInstrument7Member
EB-5 long-term promissory notes
Outstanding accrued interest	34AMTX_OutstandingAccruedInterest / us-gaap_DebtInstrumentAxis = AMTX_DebtInstrument8Member
Unsecured working capital loans
Advances	7,700AMTX_Advances / us-gaap_DebtInstrumentAxis = AMTX_DebtInstrument9Member	5,200AMTX_Advances / us-gaap_DebtInstrumentAxis = AMTX_DebtInstrument9Member
Principal payments made	8,300us-gaap_RepaymentsOfNotesPayable / us-gaap_DebtInstrumentAxis = AMTX_DebtInstrument9Member	4,800us-gaap_RepaymentsOfNotesPayable / us-gaap_DebtInstrumentAxis = AMTX_DebtInstrument9Member
Interest payments	176us-gaap_InterestPaid / us-gaap_DebtInstrumentAxis = AMTX_DebtInstrument9Member	181us-gaap_InterestPaid / us-gaap_DebtInstrumentAxis = AMTX_DebtInstrument9Member
Debt obligation	1,300us-gaap_ShortTermBorrowings / us-gaap_DebtInstrumentAxis = AMTX_DebtInstrument9Member	1,900us-gaap_ShortTermBorrowings / us-gaap_DebtInstrumentAxis = AMTX_DebtInstrument9Member
Short-term notes with a series of grants issued by the Maryland Department of Business and Economic Development
Other long term liabilities	277us-gaap_OtherLiabilitiesNoncurrent / us-gaap_DebtInstrumentAxis = AMTX_DebtInstrument10Member
Other current liabilities	$ 88us-gaap_OtherLiabilitiesCurrent / us-gaap_DebtInstrumentAxis = AMTX_DebtInstrument10Member

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