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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
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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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