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Income Taxes (Deferred Tax Assets and Liabilities) (Details) (USD $) In Thousands, unless otherwise specified | Jan. 31, 2013 | Jan. 31, 2012
--- | --- | ---
Deferred tax assets |  |
Accrued vacation and sick leave | $ 830 | $ 879
Retirement plans | 10,343 | 9,820
Insurance reserves | 1,193 | 1,183
Warranty | 451 | 595
Net operating loss carryforwards | 12,072 | 11,255
Intangibles | 272 | 338
Inventory | 723 | 146
Other | 1,250 | 1,486
Total deferred tax assets | 27,134 | 25,702
Deferred tax liabilities |  |
Tax in excess of book depreciation | (1,540) | (1,793)
Other | (81) | (71)
Total deferred tax liabilities | (1,621) | (1,864)
Valuation allowance | (24,601) | (22,859)
Net deferred tax asset | 912 | 979
Current deferred tax liabilities | (572) | (1,221)
Long-term deferred tax assets | $ 1,484 | $ 2,200

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