Quarterly report pursuant to sections 13 or 15(d)

Stock Options and Warrants (Details)

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Stock Options and Warrants (Details) (USD $)
3 Months Ended
Aug. 31, 2012
May 31, 2012
Stock option and warrant activity    
Options and warrants outstanding, Number of Shares 10,327,664  
Options and warrants outstanding, Weighted Average Exercise Price $ 1.60  
Options and warrants outstanding, Weighted Average Remaining Contractual Life 2 years 8 months 1 day 3 years 2 months 12 days
Options and warrants outstanding, Aggregate Intrinsic Value $ 2,308,279  
Granted, Number of Shares 875,000  
Granted, Weighted Average Exercise Price $ 0.44  
Exercised, Number of Shares (755,000)  
Exercised, Weighted Average Exercise Price $ 0.25  
Forfeited/expired/cancelled, Number of Shares (750,000)  
Forfeited/expired/cancelled, Weighted Average Exercise Price $ 2.00  
Options and warrants outstanding, Number of Shares 9,697,664 10,327,664
Options and warrants outstanding, Weighted Average Exercise Price $ 1.57 $ 1.60
Options and warrants outstanding, Aggregate Intrinsic Value 147,442 2,308,279
Outstanding exercisable, Number of Shares 8,178,451  
Outstanding exercisable, Weighted Average Exercise Price $ 1.47  
Outstanding exercisable, Weighted Average Remaining Contractual Life 2 years 8 months 1 day  
Outstanding exercisable, Aggregate Intrinsic Value $ 147,442