Note 8 - Retirement Plans (Details Textual) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Oct. 31, 2022	Oct. 31, 2022	Oct. 31, 2021
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement		$ (813)	$ (0)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax, Attributable to Parent, Total	$ 100	100
Defined Benefit Plan, Expect Surplus Investment Balance	900	900
Other Nonoperating Income (Expense) [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement	$ (900)	$ (900)