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17. Parent Company Financial Statements (Unaudited) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011
Current assets
Prepaid expenses	$ 1,392us-gaap_PrepaidExpenseCurrent		$ 584us-gaap_PrepaidExpenseCurrent
Total current assets	7,933us-gaap_AssetsCurrent		12,707us-gaap_AssetsCurrent
Other assets	2,929us-gaap_OtherAssets		2,923us-gaap_OtherAssets
Total Assets	89,176us-gaap_Assets		97,142us-gaap_Assets
Liabilities & stockholders' deficit
Accounts payable	8,339us-gaap_AccountsPayableCurrent		9,366us-gaap_AccountsPayableCurrent
Other current liabilities	3,590us-gaap_OtherLiabilitiesCurrent		6,245us-gaap_OtherLiabilitiesCurrent
Total current liabilities	27,316us-gaap_LiabilitiesCurrent		36,117us-gaap_LiabilitiesCurrent
Subsidiary obligation in excess of investment
Total long term liabilities	64,832us-gaap_LongTermDebt		73,792us-gaap_LongTermDebt
Stockholders' deficit
Series B Preferred convertible stock	2us-gaap_PreferredStockValue		2us-gaap_PreferredStockValue
Common stock	21us-gaap_CommonStockValue	[1]	20us-gaap_CommonStockValue	[1]
Additional paid-in capital	87,080us-gaap_AdditionalPaidInCapitalCommonStock	[1]	84,373us-gaap_AdditionalPaidInCapitalCommonStock	[1]
Accumulated deficit	(87,113)us-gaap_RetainedEarningsAccumulatedDeficit		(94,246)us-gaap_RetainedEarningsAccumulatedDeficit
Accumulated other comprehensive loss	(2,962)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax		(2,916)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Total stockholders' deficit	(2,972)us-gaap_StockholdersEquity		(12,767)us-gaap_StockholdersEquity		3,514us-gaap_StockholdersEquity	(22,204)us-gaap_StockholdersEquity
Total liabilities & stockholders' deficit	89,176us-gaap_LiabilitiesAndStockholdersEquity		97,142us-gaap_LiabilitiesAndStockholdersEquity
Parent Company Financial Statements
Current assets
Cash and cash equivalents	65AMTX_CashAndCashEquivalents / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember		14AMTX_CashAndCashEquivalents / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember
Intercompany receivables	24,578AMTX_IntercompanyReceivables / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember		27,627AMTX_IntercompanyReceivables / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember
Prepaid expenses	609us-gaap_PrepaidExpenseCurrent / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember		0us-gaap_PrepaidExpenseCurrent / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember
Total current assets	25,252us-gaap_AssetsCurrent / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember		27,641us-gaap_AssetsCurrent / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember
Investment in Aemetis International, Inc.	1,082AMTX_InvestmentInAemetisInternationalInc. / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember		2,679AMTX_InvestmentInAemetisInternationalInc. / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember
Investment in Aemetis Americas, Inc	0AMTX_InvestmentInAemetisAmericasInc / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember		0AMTX_InvestmentInAemetisAmericasInc / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember
Total investments in Subsidiaries, net of advances	1,082AMTX_TotalInvestmentsInSubsidiariesNetOfAdvances / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember		2,679AMTX_TotalInvestmentsInSubsidiariesNetOfAdvances / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember
Other assets	23us-gaap_OtherAssets / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember		23us-gaap_OtherAssets / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember
Total Assets	26,357us-gaap_Assets / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember		30,343us-gaap_Assets / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember
Liabilities & stockholders' deficit
Accounts payable	2,869us-gaap_AccountsPayableCurrent / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember		3,397us-gaap_AccountsPayableCurrent / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember
Outstanding checks in excess of cash	0AMTX_OutstandingChecksInExcessOfCash / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember		0AMTX_OutstandingChecksInExcessOfCash / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember
Mandatorily redeemable Series B convertibe preferred	2,641AMTX_MandatorilyRedeemableSeriesBConvertibePreferred / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember		2,540AMTX_MandatorilyRedeemableSeriesBConvertibePreferred / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember
Other current liabilities	996us-gaap_OtherLiabilitiesCurrent / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember		1,678us-gaap_OtherLiabilitiesCurrent / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember
Total current liabilities	6,506us-gaap_LiabilitiesCurrent / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember		7,615us-gaap_LiabilitiesCurrent / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember
Subsidiary obligation in excess of investment
Investment in AE Advanced Fuels, Inc.	18,497AMTX_InvestmentInAeAdvancedFuelsInc. / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember		31,325AMTX_InvestmentInAeAdvancedFuelsInc. / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember
Investment in Aemetis Americas, Inc	205AMTX_InvestmentInAemetisAmericasIncObligationInExcessOfInvestment / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember		247AMTX_InvestmentInAemetisAmericasIncObligationInExcessOfInvestment / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember
Investment in Aemetis Biofuels, Inc.	2,741AMTX_InvestmentInAemetisBiofuelsIncObligationInExcessOfInvestment / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember		2,741AMTX_InvestmentInAemetisBiofuelsIncObligationInExcessOfInvestment / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember
Investment in Aemetis Technologies, Inc.	1,031AMTX_InvestmentInAemetisTechnologiesIncObligationInExcessOfInvestment / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember		833AMTX_InvestmentInAemetisTechnologiesIncObligationInExcessOfInvestment / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember
Investment in Biofuels Marketing, Inc.	349AMTX_InvestmentInBiofuelsMarketingIncObligationInExcessOfInvestment / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember		349AMTX_InvestmentInBiofuelsMarketingIncObligationInExcessOfInvestment / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember
Total subsidiary obligation in excess of investment	22,823AMTX_TotalSubsidiaryObligationInExcessOfInvestmentObligationInExcessOfInvestment / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember		35,495AMTX_TotalSubsidiaryObligationInExcessOfInvestmentObligationInExcessOfInvestment / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember
Total long term liabilities	22,823us-gaap_LongTermDebt / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember		35,495us-gaap_LongTermDebt / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember
Stockholders' deficit
Series B Preferred convertible stock	2us-gaap_PreferredStockValue / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember		2us-gaap_PreferredStockValue / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember
Common stock	21us-gaap_CommonStockValue / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember		20us-gaap_CommonStockValue / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember
Additional paid-in capital	87,080us-gaap_AdditionalPaidInCapitalCommonStock / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember		84,373us-gaap_AdditionalPaidInCapitalCommonStock / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember
Accumulated deficit	(87,113)us-gaap_RetainedEarningsAccumulatedDeficit / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember		(94,246)us-gaap_RetainedEarningsAccumulatedDeficit / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember
Accumulated other comprehensive loss	(2,962)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember		(2,916)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember
Total stockholders' deficit	(2,972)us-gaap_StockholdersEquity / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember		(12,767)us-gaap_StockholdersEquity / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember
Total liabilities & stockholders' deficit	$ 26,357us-gaap_LiabilitiesAndStockholdersEquity / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember		$ 30,343us-gaap_LiabilitiesAndStockholdersEquity / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember
[1] The Common Stock and Additional paid-in capital for all periods presented reflect the one-for-ten reverse split, which took effect May 15, 2014.

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