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Note 16 - Stock-based Compensation Plans - Summary of CRSU Plan Activity (Details) - shares
 12 Months Ended
Jan. 31, 2018
Jan. 31, 2017
Jan. 31, 2016
Number of Units Outstanding, CRSU (in shares) 77,329 100,749  
Weighted-Average Remaining Contractual Life, CRSU (Year) 1 year 182 days 1 year 146 days 1 year 219 days
Number of Units Granted, CRSU (in shares) 32,978 43,218  
Number of Units Vested and settled in cash, CRSU (in shares) (50,802) (66,638)  
Number of Units Outstanding, CRSU (in shares) 58,171 77,329 100,749
Number of Units Forfeited, CRSU (in shares) (1,334)    
Non-vested at January 31, 2016, CRSU (in shares) 51,651    
Non-vested at January 31, 2016, Weighted-Average Remaining Contractual Life, CRSU (Year) 1 year 182 days