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Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands | Jan. 31, 2019 | Jan. 31, 2018
--- | --- | ---
Deferred tax assets |  |
Accrued vacation and sick leave | $ 892 | $ 1,015
Retirement plans | 2,748 | 3,756
Insurance reserves | 381 | 451
Warranty | 182 | 242
Net operating loss carryforwards | 5,303 | 4,722
Inventory | 1,320 | 1,085
§ 163 (j) Limitation | 540 | 0
Other | 765 | 624
Total deferred tax assets | 12,131 | 11,895
Deferred tax liabilities |  |
Tax in excess of book depreciation | (720) | (811)
Other | (57) | (66)
Total deferred tax liabilities | (777) | (877)
Valuation allowance | (1,756) | (925)
Net long term deferred tax asset | $ 9,598 | $ 10,093

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