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Post-effective amendment to a registration statement that is not immediately effective upon filing

Stockholders' Equity (Deficiency) (Schedule of Stock Options Activity) (Details)

v2.4.0.8
Stockholders' Equity (Deficiency) (Schedule of Stock Options Activity) (Details) (USD $)
 3 Months Ended 12 Months Ended
Jul. 31, 2014
Apr. 30, 2014
Stock Incentive Plan and Stock Option Grants to Employees and Directors [Member]
    
Number of Shares    
Balance Outstanding, April 30, 2013 10,476,412 7,344,381
Granted    3,778,711
Exercised      
Forfeited (10,000) (646,680)
Expired      
Balance Outstanding, April 30, 2014 10,466,412 10,476,412
Exercisable, April 30, 2014 5,082,712 2,050,332
Weighted Average Exercise Price    
Balance Outstanding, April 30, 2013 $ 0.35 $ 0.35
Weighted average exercise price of options granted    $ 0.25
Exercised      
Forfeited    $ 0.35
Expired      
Balance Outstanding, April 30, 2014 $ 0.23 $ 0.35
Exercisable, April 30, 2014 $ 0.27 $ 0.35
Weighted Average Remaining Contractual Term    
Balance Outstanding, April 30, 2014 3 years 6 months 4 years
Exercisable, April 30, 2014 3 years 4 months 24 days 3 years 9 months 18 days
Aggregate Intrinsic Value    
Balance Outstanding, April 30, 2014      
Exercisable, April 30, 2014      
Stock Option Grants to Non-Employees [Member]
    
Number of Shares    
Balance Outstanding, April 30, 2013 270,000 270,000
Granted      
Exercised      
Forfeited (50,000)   
Expired      
Balance Outstanding, April 30, 2014 220,000 270,000
Exercisable, April 30, 2014 73,333   
Weighted Average Exercise Price    
Balance Outstanding, April 30, 2013 $ 0.35 $ 0.35
Weighted average exercise price of options granted      
Exercised      
Forfeited $ 0.19   
Expired      
Balance Outstanding, April 30, 2014 $ 0.30 $ 0.35
Exercisable, April 30, 2014 $ 0.30  
Weighted Average Remaining Contractual Term    
Balance Outstanding, April 30, 2014 2 years 9 months 18 days 4 years
Exercisable, April 30, 2014 2 years 9 months 18 days  
Aggregate Intrinsic Value    
Balance Outstanding, April 30, 2014 2.8   
Exercisable, April 30, 2014 $ 2.8