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Note 16 - Stock-based Compensation Plans Summary of Performance 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, shares (in shares) 657,209    
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    
Performance Shares [Member]      
Number of Units Outstanding (in shares) 337,647 253,537  
Weighted-Average Grant Date Fair Value, PSU (in dollars per share) $ 13.73 $ 12.39  
Weighted-Average Remaining Contractual, PSU (Year) 6 years 36 days 6 years 219 days 7 years 73 days
Aggregate Intrinsic Value, PSU $ 11.9 $ 7.3 $ 4.9
Number of PSUs Granted (in shares) 51,121 54,480  
PSUs Granted, Weighted-Average Granted Date Fair Value (in dollars per share) $ 30.13 $ 23.37  
Performance units issued (in shares) 51,752 29,630  
Performance units issued, weighted-average granted date fair value (in dollars per share) $ 14.37 $ 9.26  
Number of Units Outstanding (in shares) 440,520 337,647 253,537
Weighted-Average Grant Date Fair Value, PSU (in dollars per share) $ 15.91 $ 13.73 $ 12.39
Vested or expected to vest at January 31, 2018, shares (in shares) 440,520    
Vested or expected to vest at January 31, 2018, weighted-average exercise price (in dollars per share) $ 15.91    
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 $ 11.9    
Exercisable at January 31, 2018, number of units (in shares) 334,919    
Exercisable at January 31, 2018, PSU weighted-average granted date fair value (in dollars per share) $ 12.46    
Exercisable at January 31, 2018, Weighted-Average Remaining Contractual, PSU (Year) 5 years 109 days    
Exercisable at January 31, 2018, Aggregate Intrinsic Value, PSU $ 9.0