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Note 17 - Stock-based Compensation Plans - Summary of CRSU Plan Activity (Details) - shares
 12 Months Ended
Jan. 31, 2020
Jan. 31, 2019
Jan. 31, 2018
Number of Units Outstanding, CRSU (in shares) 45,063 58,171  
Weighted-Average Remaining Contractual Life, CRSU (Year) 1 year 219 days 1 year 219 days 1 year 182 days
Number of Units Granted, CRSU (in shares) 30,086 32,261  
Number of Units Vested and settled in cash, CRSU (in shares) (32,422) (45,369)  
Number of Units Outstanding, CRSU (in shares) 42,727 45,063 58,171
Non-vested, CRSU (in shares) 42,727    
Non-vested, Weighted-Average Remaining Contractual Life, CRSU (Year) 1 year 219 days