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1. Nature of Activities and Summary of Significant Accounting Policies (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Accounting Policies [Abstract]
Net income (loss)	$ (8,643)us-gaap_NetIncomeLoss	$ 7,687us-gaap_NetIncomeLoss
Shares:
Weighted average shares outstanding-basic	20,595us-gaap_WeightedAverageNumberOfSharesIssuedBasic	20,007us-gaap_WeightedAverageNumberOfSharesIssuedBasic
Weighted average dilutive share equivalents from preferred shares		2,384us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock
Weighted average dilutive share equivalents from stock options		167AMTX_WeightedAverageNumberOfSharesStockOptions
Weighted average dilutive share equivalents from common warrants		94AMTX_WeightedAverageNumberOfSharesCommonWarrants
Weighted average dilutive share equivalents from convertible promissory note		5AMTX_WeightedAverageDilutiveShareEquivalentsFromConvertiblePromissoryNote
Weighted average shares outstanding-diluted	20,595us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	22,657us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Earnings (loss) per share-basic	$ (0.42)us-gaap_EarningsPerShareBasic	$ 0.38us-gaap_EarningsPerShareBasic
Earnings (loss) per share-diluted	$ (0.42)us-gaap_EarningsPerShareDiluted	$ 0.34us-gaap_EarningsPerShareDiluted

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