Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Jan. 31, 2024	Jan. 31, 2023
Deferred tax assets
Accrued vacation and sick leave	$ 2,143	$ 1,925
Retirement plans	2,391	2,729
Insurance reserves	197	325
Warranty	128	156
Net operating loss carryforwards	599	1,949
Right of use liability	1,935	3,087
Inventory	1,878	1,820
Other	536	401
Total deferred tax assets	9,807	12,392
Deferred tax liabilities
Tax in excess of book depreciation	(882)	(987)
Right of use assets	(1,663)	(2,630)
Other	(377)	(111)
Total deferred tax liabilities	(2,922)	(3,728)
Valuation allowance	(251)	(864)
Net long term deferred tax asset	$ 6,634	$ 7,800