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SHAREHOLDERS' EQUITY (Details) - Stock Options Summary - $ / shares
12 Months Ended
May 31, 2017
May 31, 2016
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Range of Exercise Price, Minimum $ 0.43 $ 0.38
Range of Exercise Price, Maximum 1.04 $ 0.84
Range Of Exercise Price $0.71 - $0.84 [Member]    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Range of Exercise Price, Minimum 0.71  
Range of Exercise Price, Maximum $ 0.84  
Options Outstanding, Number (in Shares) 488,500  
Options Outstanding, Weighted Average Remaining Contractual Life 5 years 156 days  
Options Outstanding, Weighted Average Exercise Price $ 0.79  
Options Exercisable, Number (in Shares) 287,000  
Options Exercisable, Weighted Average Exercise Price $ 0.76  
Range Of Exercise Price $0.85 - $1.04 [Member]    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Range of Exercise Price, Minimum 0.85  
Range of Exercise Price, Maximum $ 1.04  
Options Outstanding, Number (in Shares) 78,500  
Options Outstanding, Weighted Average Remaining Contractual Life 1 year 328 days  
Options Outstanding, Weighted Average Exercise Price $ 0.99  
Options Exercisable, Number (in Shares) 24,000  
Options Exercisable, Weighted Average Exercise Price $ 0.96  
Range Of Exercise Price $1.20 - $1.61 [Member]    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Range of Exercise Price, Minimum 1.20  
Range of Exercise Price, Maximum $ 1.61  
Options Outstanding, Number (in Shares) 330,000  
Options Outstanding, Weighted Average Remaining Contractual Life 8 years 313 days  
Options Outstanding, Weighted Average Exercise Price $ 1.26  
Options Exercisable, Number (in Shares) 68,750  
Options Exercisable, Weighted Average Exercise Price $ 1.20