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Quarterly report pursuant to sections 13 or 15(d)

Stockholders' Equity (Schedule of Stock Option Activity) (Details)

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Stockholders' Equity (Schedule of Stock Option Activity) (Details) (USD $)
 3 Months Ended 9 Months Ended
Jan. 31, 2014
Oct. 31, 2013
Jul. 31, 2013
Jan. 31, 2013
Jul. 31, 2012
Jan. 31, 2014
Stock Incentive Plan To Employees And Directors [Member]
            
Number of Shares            
Options Outstanding, beginning balance     7,344,381     7,344,381
Issued   327,500 1,536,211     2,463,711
Exercised             
Forfeited           (495,006)
Expired             
Options Outstanding, ending balance 9,313,086         9,313,086
Weighted Average Exercise Price            
Weighted Average Exercise Price Outstanding, Beginning     $ 0.35     $ 0.35
Granted           $ 0.35
Forfeited           $ 0.34
Weighted Average Exercise Price Outstanding, Ending $ 0.34         $ 0.34
Options Outstanding, Aggregate Intrinsic Value    $ 0.35         
Options Exercisable, Weighted Average Exercise Price $ 0.35 $ 0.35       $ 0.35
Options Exercisable, Weighted Average Remaining Contractual Life (Years)           3 years 9 months 18 days
Options Outstanding, Weighted Average Remaining Contractual Life (Years)           4 years 1 month 6 days
Options Exercisable, shares 2,005,885          2,005,885
Weighted average grant-date fair value of stock options granted             
Options Exercisable, Aggregate Intrinsic Value              
Unrecognized compensation cost 684,745         684,745
Weighted average recognition period            4 years
Options granted fair value   $ 39,300 $ 184,345      
Share based compensation related to employees   147,226 148,608 99,360 52,701  
Stock Incentive Plan To Employees And Directors [Member] | Two Year Prorata Vesting [Member]
            
Number of Shares            
Issued     200,000      
Weighted Average Exercise Price            
Vesting period     2 years      
Stock Incentive Plan To Employees And Directors [Member] | Three Year Prorata Vesting [Member]
            
Number of Shares            
Issued     545,000      
Weighted Average Exercise Price            
Vesting period     3 years      
Stock Incentive Plan To Employees And Directors [Member] | Seven Month Vesting [Member]
            
Number of Shares            
Issued     791,211      
Weighted Average Exercise Price            
Vesting period     7 months      
Stock Incentive Plan To Non Employees [Member]
            
Number of Shares            
Options Outstanding, beginning balance     270,000     270,000
Issued 600,000          
Exercised             
Forfeited             
Expired             
Options Outstanding, ending balance 270,000         270,000
Weighted Average Exercise Price            
Weighted Average Exercise Price Outstanding, Beginning     $ 0.35     $ 0.35
Granted $ 0.17           
Forfeited             
Weighted Average Exercise Price Outstanding, Ending $ 0.35         $ 0.35
Options Outstanding, Aggregate Intrinsic Value              
Options Exercisable, Weighted Average Remaining Contractual Life (Years)             
Options Outstanding, Weighted Average Remaining Contractual Life (Years)           3 years 8 months 12 days
Options Exercisable, shares 58,333         58,333
Weighted average recognition period 4 years          
Options granted fair value           $ 30,000
Share based compensation related to employees 98,609          
Share based compensation related to non-employees            $ 2,244