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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, 2018
Jan. 31, 2017
Jan. 31, 2016
Vested or expected to vest at January 31, 2018, weighted-average exercise price (in dollars per share) $ 18.21    
Vested or expected to vest at January 31, 2018 (Year) 4 years 328 days    
Vested or expected to vest at January 31, 2018, aggregate intrinsic value $ 5.7    
Restricted Stock Units (RSUs) [Member]      
Number of Units Outstanding (in shares) 263,235 224,779  
Weighted-Average Grant Date Fair Value, PSU (in dollars per share) $ 11.17 $ 10.03  
Weighted-Average Remaining Contractual, PSU (Year) 6 years 36 days 6 years 255 days 7 years 146 days
Aggregate Intrinsic Value, PSU $ 8.1 $ 5.7 $ 4.3
Number of PSUs Granted (in shares) 35,785 38,456  
PSUs Granted, Weighted-Average Granted Date Fair Value (in dollars per share) $ 23.14 $ 18.81  
Number of Units Outstanding (in shares) 299,020 263,235 224,779
Weighted-Average Grant Date Fair Value, PSU (in dollars per share) $ 12.80 $ 11.17 $ 10.03
Vested or expected to vest at January 31, 2018, RSU (in shares) 299,020    
Vested or expected to vest at January 31, 2018, weighted-average exercise price (in dollars per share) $ 12.80    
Vested or expected to vest at January 31, 2018 (Year) 6 years 36 days    
Vested or expected to vest at January 31, 2018, aggregate intrinsic value $ 8.1    
Exercisable at January 31, 2018, number of units (in shares) 262,345    
Exercisable at January 31, 2018, PSU weighted-average granted date fair value (in dollars per share) $ 11.55    
Exercisable at January 31, 2018, Weighted-Average Remaining Contractual, PSU (Year) 5 years 292 days    
Exercisable at January 31, 2018, Aggregate Intrinsic Value, PSU $ 7.1