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Significant Accounting Policies (Detail) - Options and warrants granted, exercised, expired, cancelled and outstanding (USD $)
 9 Months Ended
Feb. 28, 2013
May 31, 2012
Number of Options and Warrants, Outstanding 910,625 1,004,500
Number of Options and Warrants, Weighted Average Exercise Price (in Dollars per share) $ 0.48 $ 0.46
Granted 30,000  
Granted (in Dollars per share) $ 0.67  
Exercised (97,875)  
Exercised (in Dollars per share) $ 0.41  
Cancelled or expired (26,000)  
Cancelled or expired (in Dollars per share) $ 0.42  
Employee [Member]
    
Number of Options and Warrants, Outstanding 910,625 1,004,500
Granted 30,000  
Exercised (97,875)  
Cancelled or expired (26,000)  
Non Employee [Member]
    
Number of Options and Warrants, Outstanding      
Granted     
Exercised     
Cancelled or expired