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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 | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Accounting Policies [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | $ (3,740)us-gaap_NetIncomeLoss | $ 464 us-gaap_NetIncomeLoss | $ 2,722 us-gaap_NetIncomeLoss | $ 7,687 us-gaap_NetIncomeLoss | $ 3,258 us-gaap_NetIncomeLoss | $ (8,289)us-gaap_NetIncomeLoss | $ (9,592)us-gaap_NetIncomeLoss | $ (9,814)us-gaap_NetIncomeLoss | $ 7,133 us-gaap_NetIncomeLoss |  | $ (24,437)us-gaap_NetIncomeLoss |  | $ (4,282)us-gaap_NetIncomeLoss |
Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average shares outstanding-basic |  |  |  |  |  |  |  |  | 20,371 us-gaap_WeightedAverageNumberOfSharesIssuedBasic |  | 19,101 us-gaap_WeightedAverageNumberOfSharesIssuedBasic |  | 15,102 us-gaap_WeightedAverageNumberOfSharesIssuedBasic |
Weighted average dilutive share equivalents from preferred shares |  |  |  |  |  |  |  |  | 220 us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock |  |  |  |  |
Weighted average dilutive share equivalents from stock options |  |  |  |  |  |  |  |  | 269 AMTX_WeightedAverageNumberOfSharesStockOptions |  |  |  |  |
Weighted average dilutive share equivalents from common warrants |  |  |  |  |  |  |  |  | 187 AMTX_WeightedAverageNumberOfSharesCommonWarrants |  |  |  |  |
Weighted average shares outstanding-diluted | 20,630 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 21,476 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 20,948 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 22,657 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 20,272 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 19,390 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 18,964 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 18,223 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 21,047 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | [1] | 19,101 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | [1] | 15,102 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | [1]
Earnings (loss) per share-basic |  |  |  |  |  |  |  |  | $ 0.35 us-gaap_EarningsPerShareBasic | [1] | $ (1.28)us-gaap_EarningsPerShareBasic | [1] | $ (0.28)us-gaap_EarningsPerShareBasic | [1]
Earnings (loss) per share-diluted |  |  |  |  |  |  |  |  | $ 0.34 us-gaap_EarningsPerShareDiluted | [1] | $ (1.28)us-gaap_EarningsPerShareDiluted | [1] | $ (0.28)us-gaap_EarningsPerShareDiluted | [1]
[1] | The Earnings per share and Weighted average shares outstanding for all periods presented reflect the one-for-ten reverse split, which took effect May 15, 2014.

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