Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Jan. 31, 2023	Jan. 31, 2022
Deferred tax assets
Accrued vacation and sick leave	$ 1,925	$ 943
Retirement plans	2,729	3,930
Insurance reserves	325	300
Warranty	156	154
Net operating loss carryforwards	1,949	4,445
Right of use liability	3,087	4,159
Inventory	1,820	2,124
Other	401	361
Total deferred tax assets	12,392	16,416
Deferred tax liabilities
Tax in excess of book depreciation	(987)	(984)
Right of use assets	(2,630)	(3,567)
Other	(111)	(54)
Total deferred tax liabilities	(3,728)	(4,605)
Valuation allowance	(864)	(11,412)
Net long term deferred tax asset	$ 7,800	$ 399