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Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands | Jan. 31, 2021 | Jan. 31, 2020
--- | --- | ---
Deferred tax assets |  |
Accrued vacation and sick leave | $ 835 | $ 1,264
Retirement plans | 5,657 | 5,448
Insurance reserves | 293 | 443
Warranty | 181 | 207
Net operating loss carryforwards | 4,501 | 3,658
Right of use liabilities | 5,237 | 6,067
Inventory | 1,287 | 1,175
Business interest expense limitation | 0 | 224
Other | 324 | 301
Total deferred tax assets | 18,315 | 18,787
Deferred tax liabilities |  |
Tax in excess of book depreciation | (924) | (802)
Right of use assets | (4,541) | (5,519)
Other | (70) | (53)
Total deferred tax liabilities | (5,535) | (6,374)
Valuation allowance | (1,064) | (1,183)
Net long term deferred tax asset | $ 11,716 | $ 11,230

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