Quarterly report pursuant to Section 13 or 15(d)

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

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Stockholders' Equity (Deficiency) (Schedule of Stock Options Activity) (Details) (USD $)
 0 Months Ended 6 Months Ended
Oct. 31, 2014
Apr. 30, 2014
Oct. 31, 2014
Stock Incentive Plan and Stock Option Grants to Employees and Directors [Member]
      
Number of Shares      
Balance Outstanding, April 30, 2014     10,476,412
Granted     2,800,000
Exercised       
Forfeited     (20,000)
Expired       
Balance Outstanding, October 31, 2014 13,256,412 10,476,412 13,256,412
Exercisable, October 31, 2014 5,710,470   5,710,470
Weighted Average Exercise Price      
Balance Outstanding, April 30, 2014     $ 0.23
Weighted average exercise price of options granted     $ 0.16
Exercised       
Forfeited     $ 0.19
Expired       
Balance Outstanding, October 31, 2014 $ 0.21 $ 0.23 $ 0.21
Exercisable, October 31, 2014 $ 0.26   $ 0.26
Weighted Average Remaining Contractual Term      
Balance Outstanding, April 30, 2014 3 years 7 months 6 days 3 years 6 months  
Granted     4 years 10 months 24 days
Forfeited     4 years 1 month 6 days
Balance Outstanding, October 31, 2014 3 years 7 months 6 days 3 years 6 months  
Exercisable, October 31, 2014 3 years 1 month 6 days    
Aggregate Intrinsic Value      
Balance Outstanding, April 30, 2014       
Granted     257,000
Forfeited     1,200
Balance Outstanding, October 31, 2014 738,406    738,406
Exercisable, October 31, 2014 191,650   191,650
Stock Option Grants to Non-Employees [Member]
      
Number of Shares      
Balance Outstanding, April 30, 2014     270,000
Granted       
Exercised       
Forfeited     (50,000)
Expired       
Balance Outstanding, October 31, 2014 220,000 270,000 220,000
Exercisable, October 31, 2014 73,333   73,333
Weighted Average Exercise Price      
Balance Outstanding, April 30, 2014     $ 0.28
Weighted average exercise price of options granted       
Exercised       
Forfeited     $ 0.19
Expired       
Balance Outstanding, October 31, 2014 $ 0.30 $ 0.28 $ 0.30
Exercisable, October 31, 2014 $ 0.30   $ 0.30
Weighted Average Remaining Contractual Term      
Balance Outstanding, April 30, 2014 2 years 7 months 6 days 2 years 9 months 18 days  
Forfeited     3 years 8 months 12 days
Balance Outstanding, October 31, 2014 2 years 7 months 6 days 2 years 9 months 18 days  
Exercisable, October 31, 2014 2 years 7 months 6 days    
Aggregate Intrinsic Value      
Balance Outstanding, April 30, 2014       
Forfeited       
Balance Outstanding, October 31, 2014 4,500    4,500
Exercisable, October 31, 2014 $ 1,500   $ 1,500