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Income Taxes (Deferred Tax Assets and Liabilities) (Details) (USD $)
In Thousands, unless otherwise specified
Jan. 31, 2015
Jan. 31, 2014
Deferred tax assets    
Accrued vacation and sick leave $ 1,003us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsCompensatedAbsences $ 913us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsCompensatedAbsences
Retirement plans 10,887us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions 8,960us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions
Insurance reserves 830us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsSelfInsurance 956us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsSelfInsurance
Warranty 487us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsWarrantyReserves 481us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsWarrantyReserves
Net operating loss carryforwards 13,303us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 12,494us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Intangibles 145us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets 207us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets
Inventory 1,472us-gaap_DeferredTaxAssetsInventory 1,590us-gaap_DeferredTaxAssetsInventory
Other 595us-gaap_DeferredTaxAssetsOther 907us-gaap_DeferredTaxAssetsOther
Total deferred tax assets 28,722us-gaap_DeferredTaxAssetsGross 26,508us-gaap_DeferredTaxAssetsGross
Deferred tax liabilities    
Tax in excess of book depreciation (1,458)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (1,407)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Other (85)us-gaap_DeferredTaxLiabilitiesOther (76)us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liabilities (1,543)us-gaap_DeferredIncomeTaxLiabilities (1,483)us-gaap_DeferredIncomeTaxLiabilities
Valuation allowance (26,399)us-gaap_DeferredTaxAssetsValuationAllowance (24,210)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred tax asset 780us-gaap_DeferredTaxAssetsLiabilitiesNet 815us-gaap_DeferredTaxAssetsLiabilitiesNet
Deferred Tax Assets, Net, Current 156us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent 203us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
Long-term deferred tax assets $ 624us-gaap_DeferredTaxAssetsNetNoncurrent $ 611us-gaap_DeferredTaxAssetsNetNoncurrent