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Note 16 - Stock-based Compensation Plans - Options Outstanding and Options Exercisable (Details)
 12 Months Ended
Jan. 31, 2018
$ / shares
shares
Weighted Average Exercise Price, Options Outstanding (in dollars per share) $ 18.21
Number of Stock Options, Options Outstanding (in shares) | shares 657,209
Weighted Average Remaining Contractual Life, Options Outstanding (Year) 4 years 328 days
Weighted Average Exercise Price, Options Exercisable (in dollars per share) $ 16.25
Number of Stock Options, Options Exercisable (in shares) | shares 328,642
Range 1 [Member]  
Range of Exercise Prices, Lower Limit (in dollars per share) $ 4.89
Range of Exercise Prices, Upper Limit (in dollars per share) 6.93
Weighted Average Exercise Price, Options Outstanding (in dollars per share) $ 6.31
Number of Stock Options, Options Outstanding (in shares) | shares 38,777
Weighted Average Remaining Contractual Life, Options Outstanding (Year) 1 year 36 days
Weighted Average Exercise Price, Options Exercisable (in dollars per share) $ 6.31
Number of Stock Options, Options Exercisable (in shares) | shares 38,777
Range 2 [Member]  
Range of Exercise Prices, Lower Limit (in dollars per share) $ 11.73
Range of Exercise Prices, Upper Limit (in dollars per share) 11.89
Weighted Average Exercise Price, Options Outstanding (in dollars per share) $ 11.87
Number of Stock Options, Options Outstanding (in shares) | shares 174,500
Weighted Average Remaining Contractual Life, Options Outstanding (Year) 3 years 146 days
Weighted Average Exercise Price, Options Exercisable (in dollars per share) $ 11.88
Number of Stock Options, Options Exercisable (in shares) | shares 108,000
Range 3 [Member]  
Range of Exercise Prices, Lower Limit (in dollars per share) $ 19.19
Range of Exercise Prices, Upper Limit (in dollars per share) 20.86
Weighted Average Exercise Price, Options Outstanding (in dollars per share) $ 19.43
Number of Stock Options, Options Outstanding (in shares) | shares 170,932
Weighted Average Remaining Contractual Life, Options Outstanding (Year) 5 years 109 days
Weighted Average Exercise Price, Options Exercisable (in dollars per share) $ 19.27
Number of Stock Options, Options Exercisable (in shares) | shares 102,285
Range 4 [Member]  
Range of Exercise Prices, Lower Limit (in dollars per share) $ 23.14
Range of Exercise Prices, Upper Limit (in dollars per share) 26.57
Weighted Average Exercise Price, Options Outstanding (in dollars per share) $ 23.17
Number of Stock Options, Options Outstanding (in shares) | shares 273,000
Weighted Average Remaining Contractual Life, Options Outstanding (Year) 6 years 73 days
Weighted Average Exercise Price, Options Exercisable (in dollars per share) $ 23.14
Number of Stock Options, Options Exercisable (in shares) | shares 79,580