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16. Income Tax (Details 3) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Deferred Tax Assets & (Liabilities):
Organization, start-up costs & intangible assets	$ 8,750AMTX_OrganizationStartupCostsIntangibleAssets	$ 9,303AMTX_OrganizationStartupCostsIntangibleAssets
Stock-based compensation	86AMTX_DeferredTaxAssetStockbasedCompensation	115AMTX_DeferredTaxAssetStockbasedCompensation
Property, plant and equipment	(22,015)AMTX_DeferredTaxAssetPropertyPlantAndEquipment	(18,930)AMTX_DeferredTaxAssetPropertyPlantAndEquipment
Net operating loss carryforward and Credits	49,645AMTX_DeferredTaxAssetNetOperatingLossCarryforward	49,139AMTX_DeferredTaxAssetNetOperatingLossCarryforward
Convertible debt	(5)AMTX_DeferredTaxAssetConvertibleDebt	(5)AMTX_DeferredTaxAssetConvertibleDebt
Ethanol Credits	1,500AMTX_EthanolCredit	1,500AMTX_EthanolCredit
Debt extinguishment	2,239AMTX_DeferredTaxAssetDebtExtinguishment	2,536AMTX_DeferredTaxAssetDebtExtinguishment
Other, net	592AMTX_DeferredTaxAssetOtherNet	1,544AMTX_DeferredTaxAssetOtherNet
Subtotal	40,792us-gaap_DeferredTaxAssetsGross	45,202us-gaap_DeferredTaxAssetsGross
Valuation Allowance	(40,792)us-gaap_DeferredTaxAssetsValuationAllowance	(45,202)us-gaap_DeferredTaxAssetsValuationAllowance
Deferred tax assets (liabilities)	$ 0us-gaap_DeferredTaxAssetsNet	$ 0us-gaap_DeferredTaxAssetsNet

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