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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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