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Stock-Based Compensation (Details Textual) (USD $)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended 201 Months Ended 210 Months Ended
Nov. 01, 2012
Apr. 30, 2013
Apr. 30, 2013
Apr. 30, 2012
Jul. 31, 2012
Jul. 31, 2011
Jul. 31, 2010
Jul. 31, 2009
Jul. 31, 2003
Jul. 31, 2002
Jul. 31, 1999
Jul. 31, 2012
Apr. 30, 2013
Common stock issued as employee compensation     $ 0 $ 68,483 $ 130,544 $ 100,999 $ 101,002         $ 4,011,938 $ 4,011,938
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized   14,883 14,883   47,360             47,360 14,883
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 11 months 9 days 5 months 12 days 4 years 4 months 10 days   1 year 2 months 4 days                
Issuance of stock options in exchange for services rendered         692,010 787,226 107,744 11,000 171,360 157,387 92,500    
Stock price at period end date   $ 0.026 $ 0.026   $ 0.093             $ 0.093 $ 0.026
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term           5 years 6 years 6 months            
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate           101.00% 104.00%            
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Payments           0 0            
Risk-Free Interest Rate           101.30% 0.14%            
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Outstanding, Number   27,067,667 27,067,667   10,979,634 7,340,182 7,465,638 5,067,138       10,979,634 27,067,667
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term     4 years 4 months 10 days   4 years 1 month 27 days                
Stock Option [Member]
                         
Share-based Compensation         602,384 936,465 1,765,381            
Common Stock [Member]
                         
Share-based Compensation         $ 130,544 $ 100,999 $ 104,738            
Options Held [Member]
                         
Stock price at period end date           $ 0.282              
Warrant [Member]
                         
Stock price at period end date         $ 0.093 $ 0.13 $ 0.4         $ 0.093  
Stock Option Plan 2000 [Member]
                         
Common Stock, Capital Shares Reserved for Future Issuance         2,000,000             2,000,000  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant         2,000,000             2,000,000  
Stock Option Plan 2001 [Member]
                         
Common Stock, Capital Shares Reserved for Future Issuance   4,555,222 4,555,222   12,000,000             12,000,000 4,555,222
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant         4,124,444             4,124,444  
Stock Option Plan 2006 [Member]
                         
Common Stock, Capital Shares Reserved for Future Issuance   19,389,704 19,389,704   30,000,000     10,000,000       30,000,000 19,389,704
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant         8,521,489             8,521,489