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Note 17 - Stock-based Compensation Plans - Summary of CRSU Plan Activity (Details) - shares
 12 Months Ended
Jan. 31, 2021
Jan. 31, 2020
Jan. 31, 2019
Number of Units Outstanding, CRSU (in shares) 42,727 45,063  
Weighted-Average Remaining Contractual Life, CRSU (Year) 1 year 182 days 1 year 219 days 1 year 219 days
Number of Units Granted, CRSU (in shares) 26,629 30,086  
Number of Units Vested and settled in cash, CRSU (in shares) (30,340) (32,422)  
Number of Units Forfeited, CRSU (in shares) (248)    
Number of Units Outstanding, CRSU (in shares) 38,628 42,727 45,063
Non-vested, CRSU (in shares) 38,628    
Non-vested, Weighted-Average Remaining Contractual Life, CRSU (Year) 1 year 182 days