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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
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 $ 464us-gaap_NetIncomeLoss $ 2,722us-gaap_NetIncomeLoss $ 7,687us-gaap_NetIncomeLoss $ 3,258us-gaap_NetIncomeLoss $ (8,289)us-gaap_NetIncomeLoss $ (9,592)us-gaap_NetIncomeLoss $ (9,814)us-gaap_NetIncomeLoss $ 7,133us-gaap_NetIncomeLoss $ (24,437)us-gaap_NetIncomeLoss $ (4,282)us-gaap_NetIncomeLoss
Shares                      
Weighted average shares outstanding-basic                 20,371us-gaap_WeightedAverageNumberOfSharesIssuedBasic 19,101us-gaap_WeightedAverageNumberOfSharesIssuedBasic 15,102us-gaap_WeightedAverageNumberOfSharesIssuedBasic
Weighted average dilutive share equivalents from preferred shares                 220us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock      
Weighted average dilutive share equivalents from stock options                 269AMTX_WeightedAverageNumberOfSharesStockOptions      
Weighted average dilutive share equivalents from common warrants                 187AMTX_WeightedAverageNumberOfSharesCommonWarrants      
Weighted average shares outstanding-diluted 20,630us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 21,476us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 20,948us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 22,657us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 20,272us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 19,390us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 18,964us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 18,223us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 21,047us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding [1] 19,101us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding [1] 15,102us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding [1]
Earnings (loss) per share-basic                 $ 0.35us-gaap_EarningsPerShareBasic [1] $ (1.28)us-gaap_EarningsPerShareBasic [1] $ (0.28)us-gaap_EarningsPerShareBasic [1]
Earnings (loss) per share-diluted                 $ 0.34us-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.