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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, 2018
Jan. 31, 2017
Jan. 31, 2016
Number of Stock Options Outstanding (in shares) 526,321 468,889  
Weighted-Average Exercise Price (in dollars per share) $ 12.36 $ 8.25  
Weighted-Average Remaining Contractual Life (Year) 4 years 328 days 4 years 73 days 3 years 182 days
Aggregate Intrinsic Value $ 5.7 $ 4.9 $ 5.2
Granted, shares (in shares) 274,500 170,932 0
Granted, weighted-average exercise price (in dollars per share) $ 23.18 $ 19.06  
Exercised, shares (in shares) (142,112) (113,500)  
Exercised, weighted-average exercise price (in dollars per share) $ 6.98 $ 4.93  
Forfeited, shares (in shares) (1,500)    
Forfeited, weighted-average exercise price (in dollars per share) $ 23.14    
Number of Stock Options Outstanding (in shares) 657,209 526,321 468,889
Weighted-Average Exercise Price (in dollars per share) $ 18.21 $ 12.36 $ 8.25
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    
Exercisable at January 31, 2018, shares (in shares) 328,642    
Exercisable at January 31, 2018, weighted-average exercise price (in dollars per share) $ 16.25    
Exercisable at January 31, 2018 (Year) 4 years 146 days    
Exercisable at January 31, 2018, aggregate intrinsic value $ 3.5