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.