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Note 16 - Stock-based Compensation Plans - Summary of CRSU Plan Activity (Details) - shares
 12 Months Ended
Jan. 31, 2017
Jan. 31, 2016
Jan. 31, 2015
Number of Units Outstanding, CRSU (in shares) 100,749 113,856  
Weighted-Average Remaining Contractual Life, CRSU (Year) 1 year 146 days 1 year 219 days 1 year 182 days
Number of Units Granted, CRSU (in shares) 43,218 72,817  
Number of Units Vested and settled in cash, CRSU (in shares) (66,638) (85,924)  
Number of Units Outstanding, CRSU (in shares) 77,329 100,749 113,856
Non-vested at January 31, 2016, CRSU (in shares) 77,329    
Non-vested at January 31, 2016, Weighted-Average Remaining Contractual Life, CRSU (Year) 1 year 146 days