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Note 17 - Stock-based Compensation Plans - Summary of Option Activity (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Jan. 31, 2021
Jan. 31, 2020
Jan. 31, 2019
Number of Stock Options Outstanding (in shares) 1,127,822 879,338  
Weighted-Average Exercise Price (in dollars per share) $ 26.82 $ 21.41  
Weighted-Average Remaining Contractual Life (Year) 4 years 328 days 4 years 219 days 4 years 255 days
Aggregate Intrinsic Value $ 28.1 $ 20.2 $ 8.7
Granted, shares (in shares) 381,859 367,173 272,144
Granted, weighted-average exercise price (in dollars per share) $ 41.51 $ 38.06  
Exercised, shares (in shares) (338,342) (94,970)  
Exercised, weighted-average exercise price (in dollars per share) $ 18.43 $ 15.62  
Forfeited, shares (in shares) (23,619) (23,719)  
Forfeited, weighted-average exercise price (in dollars per share) $ 33.88 $ 31.93  
Number of Stock Options Outstanding (in shares) 1,147,720 1,127,822 879,338
Weighted-Average Exercise Price (in dollars per share) $ 33.77 $ 26.82 $ 21.41
Vested or expected to vest, shares (in shares) 1,147,720    
Vested or expected to vest, weighted-average exercise price (in dollars per share) $ 33.77    
Vested or expected to vest, weighted-average remaining contractual life (Year) 4 years 328 days    
Vested or expected to vest, aggregate intrinsic value $ 28.1    
Exercisable, shares (in shares) 646,065    
Exercisable, weighted-average exercise price (in dollars per share) $ 29.52    
Exercisable, weighted-average remaining contractual life (Year) 4 years 109 days    
Exercisable, aggregate intrinsic value $ 18.6