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Note 17 - Stock-based Compensation Plans - Options Outstanding and Options Exercisable (Details)
 12 Months Ended
Jan. 31, 2020
$ / shares
shares
Weighted Average Exercise Price, Options Outstanding (in dollars per share) $ 26.82
Number of Stock Options, Options Outstanding (in shares) | shares 1,127,822
Weighted Average Remaining Contractual Life, Options Outstanding (Year) 4 years 219 days
Weighted Average Exercise Price, Options Exercisable (in dollars per share) $ 22.88
Number of Stock Options, Options Exercisable (in shares) | shares 718,169
Range 1 [Member]  
Range of Exercise Prices, Lower Limit (in dollars per share) $ 11.43
Range of Exercise Prices, Upper Limit (in dollars per share) 11.59
Weighted Average Exercise Price, Options Outstanding (in dollars per share) $ 11.57
Number of Stock Options, Options Outstanding (in shares) | shares 126,500
Weighted Average Remaining Contractual Life, Options Outstanding (Year) 1 year 146 days
Weighted Average Exercise Price, Options Exercisable (in dollars per share) $ 11.57
Number of Stock Options, Options Exercisable (in shares) | shares 126,500
Range 2 [Member]  
Range of Exercise Prices, Lower Limit (in dollars per share) $ 18.71
Range of Exercise Prices, Upper Limit (in dollars per share) 22.57
Weighted Average Exercise Price, Options Outstanding (in dollars per share) $ 21.17
Number of Stock Options, Options Outstanding (in shares) | shares 397,014
Weighted Average Remaining Contractual Life, Options Outstanding (Year) 3 years 292 days
Weighted Average Exercise Price, Options Exercisable (in dollars per share) $ 21.08
Number of Stock Options, Options Exercisable (in shares) | shares 357,014
Range 3 [Member]  
Range of Exercise Prices, Lower Limit (in dollars per share) $ 25.91
Range of Exercise Prices, Upper Limit (in dollars per share) 27.50
Weighted Average Exercise Price, Options Outstanding (in dollars per share) $ 27.49
Number of Stock Options, Options Outstanding (in shares) | shares 247,935
Weighted Average Remaining Contractual Life, Options Outstanding (Year) 5 years 73 days
Weighted Average Exercise Price, Options Exercisable (in dollars per share) $ 27.49
Number of Stock Options, Options Exercisable (in shares) | shares 140,461
Range 4 [Member]  
Range of Exercise Prices, Lower Limit (in dollars per share) $ 38.04
Range of Exercise Prices, Upper Limit (in dollars per share) 39.70
Weighted Average Exercise Price, Options Outstanding (in dollars per share) $ 38.07
Number of Stock Options, Options Outstanding (in shares) | shares 356,373
Weighted Average Remaining Contractual Life, Options Outstanding (Year) 6 years 73 days
Weighted Average Exercise Price, Options Exercisable (in dollars per share) $ 38.06
Number of Stock Options, Options Exercisable (in shares) | shares 94,194