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Note 16 - Stock-based Compensation Plans - Summary of Restricted Share Units Activity (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Jan. 31, 2017
Jan. 31, 2016
Jan. 31, 2015
Vested or expected to vest at January 31, 2016, weighted-average exercise price (in dollars per share) $ 12.20    
Vested or expected to vest at January 31, 2017 (Year) 4 years 73 days    
Vested or expected to vest at January 31, 2016, aggregate intrinsic value $ 4.7    
Restricted Stock Units (RSUs) [Member]      
Number of Units Outstanding (in shares) 224,779 175,592  
Weighted-Average Grant Date Fair Value, PSU (in dollars per share) $ 10.03 $ 9.94  
Weighted-Average Remaining Contractual, PSU (Year) 6 years 255 days 7 years 146 days 7 years 328 days
Aggregate Intrinsic Value, PSU $ 5.7 $ 4.3 $ 3.1
Number of PSUs Granted (in shares) 38,456 49,187  
PSUs Granted, Weighted-Average Granted Date Fair Value (in dollars per share) $ 18.81 $ 15.33  
Number of Units Outstanding (in shares) 263,235 224,779 175,592
Weighted-Average Grant Date Fair Value, PSU (in dollars per share) $ 11.17 $ 10.03 $ 9.94
Vested or expected to vest at January 31, 2016, RSU (in shares) 263,235    
Vested or expected to vest at January 31, 2016, weighted-average exercise price (in dollars per share) $ 11.17    
Vested or expected to vest at January 31, 2017 (Year) 6 years 255 days    
Vested or expected to vest at January 31, 2016, aggregate intrinsic value $ 5.7    
Exercisable at January 31, 2016, number of units (in shares) 221,201    
Exercisable at January 31, 2016, PSU weighted-average granted date fair value (in dollars per share) $ 10    
Exercisable at January 31, 2016, Weighted-Average Remaining Contractual, PSU (Year) 6 years 146 days    
Exercisable at January 31, 2016, Aggregate Intrinsic Value, PSU $ 4.8