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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, 2017
Jan. 31, 2016
Jan. 31, 2015
Vested or expected to vest at January 31, 2016, shares (in shares) 505,228    
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    
Performance Shares [Member]      
Number of Units Outstanding (in shares) 253,537 174,258  
Weighted-Average Grant Date Fair Value, PSU (in dollars per share) $ 12.39 $ 12.61  
Weighted-Average Remaining Contractual, PSU (Year) 6 years 219 days 7 years 73 days 7 years 328 days
Aggregate Intrinsic Value, PSU $ 7.3 $ 4.9 $ 3.0
Number of PSUs Granted (in shares) 54,480 49,187  
PSUs Granted, Weighted-Average Granted Date Fair Value (in dollars per share) $ 23.37 $ 19.70  
Performance units issued (in shares) 29,630 30,092  
Performance units issued, weighted-average granted date fair value (in dollars per share) $ 9.26 $ 9.34  
Number of Units Outstanding (in shares) 337,647 253,537 174,258
Weighted-Average Grant Date Fair Value, PSU (in dollars per share) $ 13.73 $ 12.39 $ 12.61
Vested or expected to vest at January 31, 2016, shares (in shares) 337,647    
Vested or expected to vest at January 31, 2016, weighted-average exercise price (in dollars per share) $ 13.73    
Vested or expected to vest at January 31, 2017 (Year) 6 years 219 days    
Vested or expected to vest at January 31, 2016, aggregate intrinsic value $ 7.3    
Exercisable at January 31, 2016, number of units (in shares) 233,980    
Exercisable at January 31, 2016, PSU weighted-average granted date fair value (in dollars per share) $ 10.30    
Exercisable at January 31, 2016, Weighted-Average Remaining Contractual, PSU (Year) 5 years 292 days    
Exercisable at January 31, 2016, Aggregate Intrinsic Value, PSU $ 5.0