Quarterly report pursuant to Section 13 or 15(d)

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

v3.6.0.2
Stockholders' Equity (Schedule of Stock Options Activity) (Details)
 6 Months Ended
Oct. 31, 2016
USD ($)
$ / shares
shares
Stock Incentive Plan and Stock Option Grants to Employees and Directors [Member]  
Number of Shares  
Balance Outstanding | shares 17,931,102
Granted | shares 4,300,000
Forfeited | shares (228,123)
Expired | shares
Balance Outstanding | shares 22,002,979
Exercisable | shares 9,839,872
Weighted Average Exercise Price  
Balance Outstanding $ 0.21
Granted 0.16
Exercised
Forfeited 0.01
Expired
Balance Outstanding 0.18
Exercisable $ 0.21
Beginning balance Outstanding 3 years 3 months 18 days
Granted 4 years 10 months 24 days
Forfeited 1 year 4 months 24 days
Ending balance Outstanding 3 years 1 month 28 days
Exercisable 1 year 6 months 26 days
Aggregate Intrinsic Value  
Balance Outstanding | $
Granted | $
Forfeited | $
Balance Outstanding | $ 1,557,341
Exercisable | $ $ 557,660
Stock Option Grants To Non Employees [Member]  
Number of Shares  
Balance Outstanding | shares 195,000
Granted | shares
Exercised | shares
Forfeited | shares
Expired | shares
Balance Outstanding | shares 195,000
Exercisable | shares 195,000
Weighted Average Exercise Price  
Balance Outstanding $ 0.28
Granted
Exercised
Forfeited
Expired
Balance Outstanding 0.29
Exercisable $ 0.29
Beginning balance Outstanding 10 months 24 days
Ending balance Outstanding 5 months 5 days
Exercisable 5 months 5 days
Aggregate Intrinsic Value  
Balance Outstanding | $
Granted | $
Forfeited | $
Balance Outstanding | $ 4,500
Exercisable | $ $ 4,500