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Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred income tax assets:    
Inventory basis difference $ 1,051us-gaap_DeferredTaxAssetsInventory $ 1,576us-gaap_DeferredTaxAssetsInventory
Accounts receivable reserve 394us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts 201us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts
Stock based compensation 1,284us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 904us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Pension liability 3,018us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions 1,604us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions
Employee benefit accrual 1,448us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits 601us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits
Product liability and warranty reserves 1,480us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsWarrantyReserves 1,417us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsWarrantyReserves
Expenses not currently deductible for tax purposes 410alg_DeferredTaxAssetsNondeductibleExpenses 1,064alg_DeferredTaxAssetsNondeductibleExpenses
Foreign net operating loss 1,379us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign 2,954us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign
State net operating loss 10us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal 76us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal
Other 0us-gaap_DeferredTaxAssetsOther 34us-gaap_DeferredTaxAssetsOther
Total deferred income tax assets 10,474us-gaap_DeferredTaxAssetsGross 10,431us-gaap_DeferredTaxAssetsGross
Less: Valuation allowance (1,064)us-gaap_DeferredTaxAssetsValuationAllowance (711)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred income tax assets 9,410us-gaap_DeferredTaxAssetsNet 9,720us-gaap_DeferredTaxAssetsNet
Deferred income tax liabilities:    
Depreciation (2,786)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (3,068)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Intangible assets (2,144)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets (1,277)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
Deferred revenue 38us-gaap_DeferredTaxLiabilitiesTaxDeferredIncome (66)us-gaap_DeferredTaxLiabilitiesTaxDeferredIncome
Expenses not currently deductible for tax purposes (356)us-gaap_DeferredTaxLiabilitiesOther (461)us-gaap_DeferredTaxLiabilitiesOther
Total deferred income tax liabilities (5,248)us-gaap_DeferredIncomeTaxLiabilities (4,872)us-gaap_DeferredIncomeTaxLiabilities
Net deferred income tax assets $ 4,162us-gaap_DeferredTaxAssetsLiabilitiesNet $ 4,848us-gaap_DeferredTaxAssetsLiabilitiesNet