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14. Quarterly Financial Data (Details) (USD $) (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
Quarterly Financial Data Details Usd
Revenues	$ 41,475us-gaap_SalesRevenueNet	$ 48,348us-gaap_SalesRevenueNet	$ 57,195us-gaap_SalesRevenueNet	$ 60,665us-gaap_SalesRevenueNet	$ 54,053us-gaap_SalesRevenueNet	$ 56,688us-gaap_SalesRevenueNet	$ 47,353us-gaap_SalesRevenueNet	$ 19,420us-gaap_SalesRevenueNet	$ 207,683us-gaap_SalesRevenueNet		$ 177,514us-gaap_SalesRevenueNet		$ 189,048us-gaap_SalesRevenueNet
Cost of goods sold	39,023us-gaap_CostOfGoodsAndServicesSold	40,633us-gaap_CostOfGoodsAndServicesSold	45,842us-gaap_CostOfGoodsAndServicesSold	45,041us-gaap_CostOfGoodsAndServicesSold	42,793us-gaap_CostOfGoodsAndServicesSold	53,652us-gaap_CostOfGoodsAndServicesSold	43,602us-gaap_CostOfGoodsAndServicesSold	19,173us-gaap_CostOfGoodsAndServicesSold	170,539us-gaap_CostOfGoodsAndServicesSold		159,220us-gaap_CostOfGoodsAndServicesSold		197,975us-gaap_CostOfGoodsAndServicesSold
Gross profit	2,452us-gaap_GrossProfit	7,715us-gaap_GrossProfit	11,353us-gaap_GrossProfit	15,624us-gaap_GrossProfit	11,260us-gaap_GrossProfit	3,036us-gaap_GrossProfit	3,751us-gaap_GrossProfit	247us-gaap_GrossProfit	37,144us-gaap_GrossProfit		18,294us-gaap_GrossProfit		(8,927)us-gaap_GrossProfit
Research and development expenses	117us-gaap_ResearchAndDevelopmentExpense	101us-gaap_ResearchAndDevelopmentExpense	141us-gaap_ResearchAndDevelopmentExpense	100us-gaap_ResearchAndDevelopmentExpense	71us-gaap_ResearchAndDevelopmentExpense	115us-gaap_ResearchAndDevelopmentExpense	124us-gaap_ResearchAndDevelopmentExpense	229us-gaap_ResearchAndDevelopmentExpense	459us-gaap_ResearchAndDevelopmentExpense		539us-gaap_ResearchAndDevelopmentExpense		620us-gaap_ResearchAndDevelopmentExpense
Selling, general and administrative expenses	3,332us-gaap_SellingGeneralAndAdministrativeExpense	2,972us-gaap_SellingGeneralAndAdministrativeExpense	3,449us-gaap_SellingGeneralAndAdministrativeExpense	2,842us-gaap_SellingGeneralAndAdministrativeExpense	3,197us-gaap_SellingGeneralAndAdministrativeExpense	3,879us-gaap_SellingGeneralAndAdministrativeExpense	3,984us-gaap_SellingGeneralAndAdministrativeExpense	4,215us-gaap_SellingGeneralAndAdministrativeExpense	12,595us-gaap_SellingGeneralAndAdministrativeExpense		15,275us-gaap_SellingGeneralAndAdministrativeExpense		11,613us-gaap_SellingGeneralAndAdministrativeExpense
Operating income/(loss)	(997)us-gaap_OperatingIncomeLoss	4,642us-gaap_OperatingIncomeLoss	7,763us-gaap_OperatingIncomeLoss	12,682us-gaap_OperatingIncomeLoss	7,992us-gaap_OperatingIncomeLoss	(958)us-gaap_OperatingIncomeLoss	(357)us-gaap_OperatingIncomeLoss	(4,197)us-gaap_OperatingIncomeLoss	24,090us-gaap_OperatingIncomeLoss		2,480us-gaap_OperatingIncomeLoss		(21,160)us-gaap_OperatingIncomeLoss
Other income/(expense)
Interest rate expense	(2,315)us-gaap_InterestExpense	(2,287)us-gaap_InterestExpense	(2,530)us-gaap_InterestExpense	(2,920)us-gaap_InterestExpense	(3,291)us-gaap_InterestExpense	(2,933)us-gaap_InterestExpense	(2,913)us-gaap_InterestExpense	(2,671)us-gaap_InterestExpense	(10,052)us-gaap_InterestExpense		(11,808)us-gaap_InterestExpense
Amortization expense	(677)us-gaap_AmortizationOfFinancingCostsAndDiscounts	(741)us-gaap_AmortizationOfFinancingCostsAndDiscounts	(2,502)us-gaap_AmortizationOfFinancingCostsAndDiscounts	(2,118)us-gaap_AmortizationOfFinancingCostsAndDiscounts	(2,103)us-gaap_AmortizationOfFinancingCostsAndDiscounts	(2,020)us-gaap_AmortizationOfFinancingCostsAndDiscounts	(6,071)us-gaap_AmortizationOfFinancingCostsAndDiscounts	(2,273)us-gaap_AmortizationOfFinancingCostsAndDiscounts	6,038us-gaap_AmortizationOfFinancingCostsAndDiscounts		12,468us-gaap_AmortizationOfFinancingCostsAndDiscounts		7,544us-gaap_AmortizationOfFinancingCostsAndDiscounts
Loss on debt extinguishment	0AMTX_LossOnDebtExtingishment	(1,231)AMTX_LossOnDebtExtingishment	0AMTX_LossOnDebtExtingishment	(115)AMTX_LossOnDebtExtingishment	0AMTX_LossOnDebtExtingishment	(2,521)AMTX_LossOnDebtExtingishment	(232)AMTX_LossOnDebtExtingishment	(956)AMTX_LossOnDebtExtingishment	(1,346)AMTX_LossOnDebtExtingishment		(3,709)AMTX_LossOnDebtExtingishment
Gain on sale of assets	0us-gaap_GainLossOnDispositionOfAssets	0us-gaap_GainLossOnDispositionOfAssets	(119)us-gaap_GainLossOnDispositionOfAssets	0us-gaap_GainLossOnDispositionOfAssets	47us-gaap_GainLossOnDispositionOfAssets	108us-gaap_GainLossOnDispositionOfAssets	48us-gaap_GainLossOnDispositionOfAssets	126us-gaap_GainLossOnDispositionOfAssets	(119)us-gaap_GainLossOnDispositionOfAssets		329us-gaap_GainLossOnDispositionOfAssets		350us-gaap_GainLossOnDispositionOfAssets
Other income/(expense)	249us-gaap_OtherNonoperatingIncomeExpense	81us-gaap_OtherNonoperatingIncomeExpense	110us-gaap_OtherNonoperatingIncomeExpense	164us-gaap_OtherNonoperatingIncomeExpense	613us-gaap_OtherNonoperatingIncomeExpense	35us-gaap_OtherNonoperatingIncomeExpense	(67)us-gaap_OtherNonoperatingIncomeExpense	163us-gaap_OtherNonoperatingIncomeExpense	604us-gaap_OtherNonoperatingIncomeExpense		744us-gaap_OtherNonoperatingIncomeExpense		(162)us-gaap_OtherNonoperatingIncomeExpense
Income (Loss) before income taxes	(3,740)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	464us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	2,722us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	7,693us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	3,258us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	(8,289)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	(9,592)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	(9,808)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	7,139us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments		(24,431)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments		(5,363)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax expense	0us-gaap_IncomeTaxExpenseBenefit	0us-gaap_IncomeTaxExpenseBenefit	0us-gaap_IncomeTaxExpenseBenefit	(6)us-gaap_IncomeTaxExpenseBenefit	0us-gaap_IncomeTaxExpenseBenefit	0us-gaap_IncomeTaxExpenseBenefit	0us-gaap_IncomeTaxExpenseBenefit	(6)us-gaap_IncomeTaxExpenseBenefit	(6)us-gaap_IncomeTaxExpenseBenefit		(6)us-gaap_IncomeTaxExpenseBenefit		1,081us-gaap_IncomeTaxExpenseBenefit
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
Other comprehensive income (loss)
Foreign currency translation adjustment	(56)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax	(98)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax	0us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax	108us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax	78us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax	(275)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax	(600)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax	199us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax	(46)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax		(598)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax		(75)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax
Comprehensive income/(loss)	$ (3,796)us-gaap_ComprehensiveIncomeNetOfTax	$ 366us-gaap_ComprehensiveIncomeNetOfTax	$ 2,722us-gaap_ComprehensiveIncomeNetOfTax	$ 7,795us-gaap_ComprehensiveIncomeNetOfTax	$ 3,336us-gaap_ComprehensiveIncomeNetOfTax	$ (8,564)us-gaap_ComprehensiveIncomeNetOfTax	$ (10,192)us-gaap_ComprehensiveIncomeNetOfTax	$ (9,615)us-gaap_ComprehensiveIncomeNetOfTax	$ 7,087us-gaap_ComprehensiveIncomeNetOfTax		$ (25,035)us-gaap_ComprehensiveIncomeNetOfTax		$ (4,357)us-gaap_ComprehensiveIncomeNetOfTax
Net (loss)/income per common share
Basic	$ (0.18)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ 0.02us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ 0.13us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ 0.38us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ 0.16us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ (0.43)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ (0.51)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ (0.54)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ 0.35us-gaap_IncomeLossFromContinuingOperationsPerBasicShare		$ (1.28)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Diluted	$ (0.18)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ 0.02us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ 0.13us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ 0.34us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ 0.16us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ (0.43)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ (0.51)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ (0.54)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ 0.34us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare		$ (1.28)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Weighted average shares outstanding
Basic	20,630us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	20,555us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	20,284us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	20,007us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	19,806us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	19,390us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	18,964us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	18,223us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	20,371us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	[1]	19,101us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	[1]	15,102us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	[1]
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]
[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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