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Note 16 -Stock-based Compensation Plans - Summary of Option Activity (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Jan. 31, 2017
Jan. 31, 2016
Jan. 31, 2015
Jan. 31, 2017
Jan. 31, 2016
Jan. 31, 2015
Number of Stock Options Outstanding (in shares) 468,889 953,264        
Weighted-Average Exercise Price (in dollars per share) $ 8.25 $ 6.33        
Weighted-Average Remaining Contractual Life (Year) 4 years 73 days 3 years 182 days 2 years 182 days      
Aggregate Intrinsic Value       $ 4.9 $ 5.2 $ 10.6
Exercised, shares (in shares) (113,500) (37,500)        
Exercised, weighted-average exercise price (in dollars per share) $ 4.93 $ 4.18        
Surrendered for Shares (in shares)   (446,875)        
Surrendered for Shares, weighted-average exercise price (in dollars per share)   $ 2.59        
Number of Stock Options Outstanding (in shares) 526,321 468,889 953,264      
Weighted-Average Exercise Price (in dollars per share) $ 12.36 $ 8.25 $ 6.33      
Granted, shares (in shares) 170,932 0 215,000      
Granted, weighted-average exercise price (in dollars per share) $ 19.06          
Number of Stock Options Outstanding (in shares) 468,889 953,264 953,264 526,321 468,889 953,264
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    
Exercisable at January 31, 2016, shares (in shares)       286,529    
Exercisable at January 31, 2016, weighted-average exercise price (in dollars per share)       $ 9.88    
Exercisable at January 31, 2017 (Year) 3 years 109 days          
Exercisable at January 31, 2016, aggregate intrinsic value       $ 3.3