Note 8 - Retirement Plans - Asset Allocation (Details) - USD ($) $ in Thousands		Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020
Plan assets		$ 7,135	$ 7,016	$ 6,550
Fair Value, Inputs, Level 1 [Member]
Plan assets		5,985	6,026
Fair Value, Inputs, Level 2 [Member]
Plan assets		321	139
Fair Value Measured at Net Asset Value Per Share [Member]
Plan assets	[1]	829	851
Defined Benefit Plan, Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Plan assets		4,119	4,112
Fixed Income Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Plan assets		1,544	1,716
Defined Benefit Plan, Real Estate [Member] | Fair Value, Inputs, Level 1 [Member]
Plan assets		322	198
Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Plan assets		$ 321	$ 139

[1] Certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been categorized in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the reconciliation of benefit obligations, plan assets and funded status of plan.