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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands, except Share data, unless otherwise specified | Common Stock | Unamortized Cost of Equity Awards | Retained Earnings | Foreign Currency Translation Adjustments | Accumulated income (loss) on derivatives | Pension Adjustments | Total
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Balances at Dec. 31, 2012 | $ 23,474 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ (927)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = amot_UnamortizedCostOfEquityAwardsMember | $ 20,528 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ 121 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember |  | $ (1,044)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | $ 42,152 us-gaap_StockholdersEquity
Balances (in shares) at Dec. 31, 2012 | 8,631 us-gaap_CommonStockSharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Stock transactions under employee benefit stock plans | 420 us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  | 420 us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan
Stock transactions under employee benefit stock plans (in shares) | 61 us-gaap_StockIssuedDuringPeriodSharesEmployeeBenefitPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |
Issuance of restricted stock, net of forfeitures | 3,141 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (3,264)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = amot_UnamortizedCostOfEquityAwardsMember |  |  |  |  | (123)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures
Issuance of restricted stock, net of forfeitures (in shares) | 399 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |
Stock compensation expense |  | 927 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = amot_UnamortizedCostOfEquityAwardsMember |  |  |  |  | 927 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
Comprehensive income (loss) |  |  |  | 652 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember | 41 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember | 1,334 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | 2,027 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Tax effect |  |  |  |  |  | (480)us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1 / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | (480)us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1
Net income |  |  | 3,953 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  | 3,953 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Dividends to Stockholders |  |  | (873)us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  | (873)us-gaap_DividendsCommonStock
Balances at Dec. 31, 2013 | 27,035 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (3,264)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = amot_UnamortizedCostOfEquityAwardsMember | 23,608 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 773 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember | 41 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember | (190)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | 48,003 us-gaap_StockholdersEquity
Balances (in shares) at Dec. 31, 2013 | 9,091 us-gaap_CommonStockSharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  | 9,091,000 us-gaap_CommonStockSharesIssued
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Stock transactions under employee benefit stock plans | 344 us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  | 344 us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan
Stock transactions under employee benefit stock plans (in shares) | 30 us-gaap_StockIssuedDuringPeriodSharesEmployeeBenefitPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |
Issuance of restricted stock, net of forfeitures | 1,074 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (1,601)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = amot_UnamortizedCostOfEquityAwardsMember |  |  |  |  | (527)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures
Issuance of restricted stock, net of forfeitures (in shares) | 92 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |
Stock compensation expense |  | 1,541 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = amot_UnamortizedCostOfEquityAwardsMember |  |  |  |  | 1,541 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
Comprehensive income (loss) |  |  |  | (5,601)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember | (43)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember | (1,123)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | (6,767)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Tax effect |  |  |  |  |  | 460 us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1 / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | 460 us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1
Net income |  |  | 13,860 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  | 13,860 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Dividends to Stockholders |  |  | (963)us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  | (963)us-gaap_DividendsCommonStock
Balances at Dec. 31, 2014 | $ 28,453 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ (3,324)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = amot_UnamortizedCostOfEquityAwardsMember | $ 36,505 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (4,828)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember | $ (2)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember | $ (853)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | $ 55,951 us-gaap_StockholdersEquity
Balances (in shares) at Dec. 31, 2014 | 9,213 us-gaap_CommonStockSharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  | 9,213,000 us-gaap_CommonStockSharesIssued

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