Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Jan. 31, 2022	Jan. 31, 2021
Deferred tax assets
Accrued vacation and sick leave	$ 943	$ 835
Retirement plans	3,930	5,657
Insurance reserves	300	293
Warranty	154	181
Net operating loss carryforwards	4,445	4,501
Right of use liabilities	4,159	5,237
Inventory	2,124	1,287
Business interest expense limitation	0	0
Other	361	324
Total deferred tax assets	16,416	18,315
Deferred tax liabilities
Tax in excess of book depreciation	(984)	(924)
Right of use assets	(3,567)	(4,541)
Other	(54)	(70)
Total deferred tax liabilities	(4,605)	(5,535)
Valuation allowance	(11,412)	(1,064)
Net long term deferred tax asset	$ 399	$ 11,716