Quarterly report pursuant to sections 13 or 15(d)

Stock Options and Warrants (Details Textual)

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Stock Options and Warrants (Details Textual) (USD $)
 3 Months Ended 106 Months Ended 3 Months Ended
Aug. 31, 2012
Aug. 31, 2012
Aug. 31, 2012
2004 Stock Incentive Plan [Member]
Aug. 31, 2011
2004 Stock Incentive Plan [Member]
Aug. 31, 2012
2004 Stock Incentive Plan [Member]
Stock Options [Member]
Aug. 31, 2012
2004 Stock Incentive Plan [Member]
Warrant [Member]
Stock Options and Warrants (Textual) [Abstract]            
Authorized shares that can be purchased for options and warrants issued     7,600,000      
Shares available for future stock option grants         3,658,500  
Common stock options granted to directors 875,000       125,000  
Exercise price         $ 1.55 $ 0.25
Vesting terms of options granted to directors         vest in quarterly increments over one year  
Expiration date of stock option         5 years  
Shares against which warrants granted to consultants           750,000
Net cash proceeds from exercise of common stock warrants $ 192,500 $ 547,750       $ 192,500
Compensation expense related to stock options and warrants 1,128,000   1,612,000 242,000    
Grant date fair value of options and warrants vested     2,092,000 190,000    
Weighted average grant date fair value of options and warrants granted     $ 0.92 $ 1.25    
Unrecognized compensation costs     $ 2,568,000      
Weighted average period over which unrecognized compensation costs is expected to be recognized     1 year 11 months 19 days