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6. STOCK OPTIONS AND WARRANTS (Tables)
3 Months Ended
Jul. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Assumptions
   July 31, 
   2015   2014 
Risk-free interest rate   2.0%    
Expected volatility   145%    
Expected lives (years)   2.2     
Expected dividend yield   0.00%    
Unvested employee stock option activity
    Options Outstanding   Weighted Average Grant Date Fair Value per Share 
Nonvested, April 30, 2015    6,600,000   $0.10 
Granted         
Vested    1,800,000    0.10 
Forfeited     –     
Nonvested, July 31, 2015    4,800,000   $0.10 
             
Range of outstanding stock options
   Exercise Prices 
Range of Exercise Price  $0.19   $0.11   $0.18 
Number of Options   25,000,000    27,200,000    250,000 
Weighted Average Remaining Contractual Life (years)   4.17    4.42    4.72 
Weighted Average Stock Price  $0.19   $0.11   $0.18 
Number of Options Exercisable   25,000,000    27,200,000    250,000 
Weighted Average Contractual Life (years)   5    5    5 
Weighted Average Exercise Price  $0.19   $0.11   $0.18 
Warrant activity
    Warrants   Weighted Average Price   Weighted Average Fair Value 
Outstanding, April 30, 2015    72,969,908   $    0.17   $    0.08 
Issued     –         
Exercised     –         
Outstanding, July 31, 2015    72,969,908    0.17    0.08 
Exercisable, July 31, 2015    72,969,908   $0.17   $0.08 
                  
Schedule of warrants outstanding by exercise range
Range of Exercise Prices  Number of Warrant Shares Exercisable at 07/31/2015   Weighted Average Remaining Contractual Life   Exercisable Weighted Average Exercise Price 
$0.075, $0.11, $0.12, $0.18 and $0.25   72,969,908    2.61   $    0.17 
                
Five Year Term - $0.08   1,056,000    2.20      
Five Year Term - $0.12   18,347,508    2.50      
Five Year Term - $0.18   19,811,200    2.42      
Five Year Term - $0.25   18,755,200    2.43      
Five Year Term - $0.11   10,000,000    4.65      
Nine Month Term - $0.11   5,000,000    0.42      
    72,969,908