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Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands | Jan. 31, 2020 | Jan. 31, 2019
--- | --- | ---
Deferred tax assets |  |
Accrued vacation and sick leave | $ 1,264 | $ 892
Retirement plans | 5,448 | 2,748
Insurance reserves | 443 | 381
Warranty | 207 | 182
Net operating loss carryforwards | 3,658 | 5,303
Right of use liabilities | 6,067 | 0
Inventory | 1,175 | 1,320
Business interest expense limitation | 224 | 540
Other | 301 | 765
Total deferred tax assets | 18,787 | 12,131
Deferred tax liabilities |  |
Tax in excess of book depreciation | (802) | (720)
Right of use assets | (5,519) | 0
Other | (53) | (57)
Total deferred tax liabilities | (6,374) | (777)
Valuation allowance | (1,183) | (1,756)
Net long term deferred tax asset | $ 11,230 | $ 9,598

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