Note 9 - Retirement Plans - Asset Allocation (Details) - USD ($) $ in Thousands		Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
Plan assets		$ 6,550	$ 6,179	$ 6,700
Fair Value, Inputs, Level 1 [Member]
Plan assets		5,642	5,424
Fair Value, Inputs, Level 2 [Member]
Plan assets		169	121
Fair Value Measured at Net Asset Value Per Share [Member]
Plan assets	[1]	739	634
Defined Benefit Plan, Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Plan assets		3,139	2,991
Fixed Income Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Plan assets		2,134	2,065
Defined Benefit Plan, Real Estate [Member] | Fair Value, Inputs, Level 1 [Member]
Plan assets		369	368
Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Plan assets		$ 169	$ 121

[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.