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Shareholders' Equity (Schedule of Stock Options Outstanding) (Details)
12 Months Ended
Jan. 31, 2016
$ / shares
shares
First Exercise Price Range [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices (Minimum) $ 1.40
Range of Exercise Prices (Maximum) $ 3.08
Options Outstanding: Shares | shares 869,600
Options Outstanding: Weighted Average Remaining Contractual Life 2 years 8 months 12 days
Options Outstanding: Weighted Average Exercise Price $ 2.65
Options Exercisable: Shares | shares 869,600
Options Exercisable: Weighted Average Exercise Price $ 2.65
Second Exercise Price Range [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices (Minimum) 6.39
Range of Exercise Prices (Maximum) $ 9.71
Options Outstanding: Shares | shares 952,800
Options Outstanding: Weighted Average Remaining Contractual Life 4 years 3 months 18 days
Options Outstanding: Weighted Average Exercise Price $ 7.14
Options Exercisable: Shares | shares 952,800
Options Exercisable: Weighted Average Exercise Price $ 7.14
Third Exercise Price Range [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices (Minimum) 17.47
Range of Exercise Prices (Maximum) $ 20.91
Options Outstanding: Shares | shares 273,300
Options Outstanding: Weighted Average Remaining Contractual Life 7 years 6 months
Options Outstanding: Weighted Average Exercise Price $ 18.58
Options Exercisable: Shares | shares 147,200
Options Exercisable: Weighted Average Exercise Price $ 17.68