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17. Parent Company Financial Statements (Details 1) (USD $) In Thousands, 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
Selling, general and administrative expenses | $ 3,332 us-gaap_SellingGeneralAndAdministrativeExpense | $ 2,972 us-gaap_SellingGeneralAndAdministrativeExpense | $ 3,449 us-gaap_SellingGeneralAndAdministrativeExpense | $ 2,842 us-gaap_SellingGeneralAndAdministrativeExpense | $ 3,197 us-gaap_SellingGeneralAndAdministrativeExpense | $ 3,879 us-gaap_SellingGeneralAndAdministrativeExpense | $ 3,984 us-gaap_SellingGeneralAndAdministrativeExpense | $ 4,215 us-gaap_SellingGeneralAndAdministrativeExpense | $ 12,595 us-gaap_SellingGeneralAndAdministrativeExpense | $ 15,275 us-gaap_SellingGeneralAndAdministrativeExpense | $ 11,613 us-gaap_SellingGeneralAndAdministrativeExpense
Operating income (loss) | (997)us-gaap_OperatingIncomeLoss | 4,642 us-gaap_OperatingIncomeLoss | 7,763 us-gaap_OperatingIncomeLoss | 12,682 us-gaap_OperatingIncomeLoss | 7,992 us-gaap_OperatingIncomeLoss | (958)us-gaap_OperatingIncomeLoss | (357)us-gaap_OperatingIncomeLoss | (4,197)us-gaap_OperatingIncomeLoss | 24,090 us-gaap_OperatingIncomeLoss | 2,480 us-gaap_OperatingIncomeLoss | (21,160)us-gaap_OperatingIncomeLoss
Other income (expense) |  |  |  |  |  |  |  |  |  |  |
Interest 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 |
Other income (expense) | 249 us-gaap_OtherNonoperatingIncomeExpense | 81 us-gaap_OtherNonoperatingIncomeExpense | 110 us-gaap_OtherNonoperatingIncomeExpense | 164 us-gaap_OtherNonoperatingIncomeExpense | 613 us-gaap_OtherNonoperatingIncomeExpense | 35 us-gaap_OtherNonoperatingIncomeExpense | (67)us-gaap_OtherNonoperatingIncomeExpense | 163 us-gaap_OtherNonoperatingIncomeExpense | 604 us-gaap_OtherNonoperatingIncomeExpense | 744 us-gaap_OtherNonoperatingIncomeExpense | (162)us-gaap_OtherNonoperatingIncomeExpense
Income (loss) before income taxes | (3,740)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 464 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 2,722 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 7,693 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 3,258 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | (8,289)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | (9,592)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | (9,808)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 7,139 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | (24,431)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | (5,363)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax expense | 0 us-gaap_IncomeTaxExpenseBenefit | 0 us-gaap_IncomeTaxExpenseBenefit | 0 us-gaap_IncomeTaxExpenseBenefit | (6)us-gaap_IncomeTaxExpenseBenefit | 0 us-gaap_IncomeTaxExpenseBenefit | 0 us-gaap_IncomeTaxExpenseBenefit | 0 us-gaap_IncomeTaxExpenseBenefit | (6)us-gaap_IncomeTaxExpenseBenefit | (6)us-gaap_IncomeTaxExpenseBenefit | (6)us-gaap_IncomeTaxExpenseBenefit | 1,081 us-gaap_IncomeTaxExpenseBenefit
Other comprehensive loss |  |  |  |  |  |  |  |  |  |  |
Foreign currency translation adjustment | (56)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax | (98)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax | 0 us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax | 108 us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax | 78 us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax | (275)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax | (600)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax | 199 us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax | (46)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax | (598)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax | (75)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax
Comprehensive income (loss) | (3,796)us-gaap_ComprehensiveIncomeNetOfTax | 366 us-gaap_ComprehensiveIncomeNetOfTax | 2,722 us-gaap_ComprehensiveIncomeNetOfTax | 7,795 us-gaap_ComprehensiveIncomeNetOfTax | 3,336 us-gaap_ComprehensiveIncomeNetOfTax | (8,564)us-gaap_ComprehensiveIncomeNetOfTax | (10,192)us-gaap_ComprehensiveIncomeNetOfTax | (9,615)us-gaap_ComprehensiveIncomeNetOfTax | 7,087 us-gaap_ComprehensiveIncomeNetOfTax | (25,035)us-gaap_ComprehensiveIncomeNetOfTax | (4,357)us-gaap_ComprehensiveIncomeNetOfTax
Parent Company Financial Statements |  |  |  |  |  |  |  |  |  |  |
Equity in subsidiary gains (losses) |  |  |  |  |  |  |  |  | 11,123 AMTX_EquityInSubsidiaryEarningsLosses / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember | (22,134)AMTX_EquityInSubsidiaryEarningsLosses / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember | (12)AMTX_EquityInSubsidiaryEarningsLosses / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | 3,942 us-gaap_SellingGeneralAndAdministrativeExpense / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember | 2,687 us-gaap_SellingGeneralAndAdministrativeExpense / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember | 2,303 us-gaap_SellingGeneralAndAdministrativeExpense / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember
Operating income (loss) |  |  |  |  |  |  |  |  | 7,181 us-gaap_OperatingIncomeLoss / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember | (24,821)us-gaap_OperatingIncomeLoss / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember | (2,315)us-gaap_OperatingIncomeLoss / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember
Other income (expense) |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | (277)us-gaap_InterestExpense / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember | (187)us-gaap_InterestExpense / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember | (1,866)us-gaap_InterestExpense / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember
Other income (expense) |  |  |  |  |  |  |  |  | 235 us-gaap_OtherNonoperatingIncomeExpense / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember | 577 us-gaap_OtherNonoperatingIncomeExpense / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember | (97)us-gaap_OtherNonoperatingIncomeExpense / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember
Income (loss) before income taxes |  |  |  |  |  |  |  |  | 7,139 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember | (24,431)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember | (4,278)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember
Income tax expense |  |  |  |  |  |  |  |  | (6)us-gaap_IncomeTaxExpenseBenefit / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember | (6)us-gaap_IncomeTaxExpenseBenefit / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember | (4)us-gaap_IncomeTaxExpenseBenefit / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember
Net gain (loss) |  |  |  |  |  |  |  |  | 7,133 AMTX_NetLoss / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember | (24,437)AMTX_NetLoss / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember | (4,282)AMTX_NetLoss / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember
Other comprehensive loss |  |  |  |  |  |  |  |  |  |  |
Foreign currency translation adjustment |  |  |  |  |  |  |  |  | (46)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember | (598)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember | (75)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember
Comprehensive income (loss) |  |  |  |  |  |  |  |  | $ 7,087 us-gaap_ComprehensiveIncomeNetOfTax / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember | $ (25,035)us-gaap_ComprehensiveIncomeNetOfTax / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember | $ (4,357)us-gaap_ComprehensiveIncomeNetOfTax / us-gaap_BusinessAcquisitionAxis = AMTX_ParentCompanyFinancialStatementsUnauditedMember

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- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=6519514 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Comprehensive Income -URI http://asc.fasb.org/extlink&oid=35737396 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e557-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=6518256 + Details
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- Definition Amount before tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6915805&loc=d3e32022-110900 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6915805&loc=d3e32211-110900 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 35 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6939497&loc=d3e30304-110892 + Details
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- Definition The net amount of other income and expense amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income (expense) recognized for the period. Such amounts may include: (a) dividends, (b) interest on securities, (c) net gains or losses on securities, (d) unusual costs, (e) gains or losses on foreign exchange transactions, and (f) miscellaneous other income and expense items. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 9 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.9) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 4 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34747878&loc=d3e3636-108311 + Details
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