9. STOCK OPTIONS AND WARRANTS (Tables)
|
12 Months Ended |
Apr. 30, 2015 |
| Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
|
| Assumptions |
| |
|
April 30, |
|
| |
|
2015 |
|
|
2014 |
|
|
2013 |
|
| Risk-free interest rate |
|
|
2 |
% |
|
|
|
|
|
|
|
|
| Expected volatility |
|
|
145 |
% |
|
|
|
|
|
|
|
|
| Expected lives (years) |
|
|
5 |
|
|
|
|
|
|
|
|
|
| Expected dividend yield |
|
|
0.00 |
% |
|
|
0.00 |
% |
|
|
0.00 |
% |
|
| Unvested employee stock option activity |
| |
|
|
Options
Outstanding |
|
|
|
Weighted
Average Grant Date Fair Value per Share |
|
| Nonvested, April 30, 2012 |
|
|
|
|
|
$ |
|
|
| Granted |
|
|
|
|
|
|
|
|
| Vested |
|
|
|
|
|
|
|
|
| Forfeited |
|
|
|
|
|
|
|
|
| Nonvested, April 30, 2013 |
|
|
|
|
|
|
|
|
| Granted |
|
|
|
|
|
|
|
|
| Vested |
|
|
|
|
|
|
|
|
| Forfeited |
|
|
|
|
|
|
|
|
| Nonvested, April 30, 2014 |
|
|
|
|
|
|
|
|
| Granted |
|
|
47,200,000 |
|
|
$ |
0.14 |
|
| Vested |
|
|
40,600,000 |
|
|
|
0.15 |
|
| Forfeited |
|
|
|
|
|
|
|
|
| Nonvested, April 30, 2015 |
|
|
6,600,000 |
|
|
$ |
0.10 |
|
|
| Employee stock option activity |
| |
|
|
Options
Outstanding |
|
|
|
Weighted
Average Grant Date Fair Value per Share |
|
| Nonvested, April 30, 2012 |
|
|
|
|
|
$ |
|
|
| Granted |
|
|
|
|
|
|
|
|
| Vested |
|
|
|
|
|
|
|
|
| Forfeited |
|
|
|
|
|
|
|
|
| Nonvested, April 30, 2013 |
|
|
|
|
|
|
|
|
| Granted |
|
|
|
|
|
|
|
|
| Vested |
|
|
|
|
|
|
|
|
| Forfeited |
|
|
|
|
|
|
|
|
| Nonvested, April 30, 2014 |
|
|
|
|
|
|
|
|
| Granted |
|
|
5,250,000 |
|
|
$ |
0.19 |
|
| Vested |
|
|
5,250,000 |
|
|
|
0.19 |
|
| Forfeited |
|
|
|
|
|
|
|
|
| Nonvested, April 30, 2015 |
|
|
|
|
|
$ |
|
|
|
| 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) |
|
|
4.42 |
|
|
|
4.67 |
|
|
|
4.98 |
|
| Weighted Average Stock Price |
|
$ |
0.19 |
|
|
$ |
0.10 |
|
|
$ |
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 |
|
|
$ |
0.10 |
|
|
$ |
0.18 |
|
|
| Warrant activity |
| |
|
|
Warrants |
|
|
|
Weighted
Average Price |
|
|
|
Weighted
Average Fair Value |
|
| Outstanding, April 30, 2012 |
|
|
|
|
|
$ |
|
|
|
$ |
|
|
| Issued |
|
|
59,433,600 |
|
|
|
0.125 |
|
|
|
0.064 |
|
| Exercised |
|
|
|
|
|
|
|
|
|
|
|
|
| Outstanding, April 30, 2013 |
|
|
59,433,600 |
|
|
|
0.125 |
|
|
|
0.064 |
|
| Issued |
|
|
|
|
|
|
|
|
|
|
|
|
| Exercised |
|
|
(1,768,000 |
) |
|
|
|
|
|
|
|
|
| Outstanding, April 30, 2014 |
|
|
57,665,600 |
|
|
|
0.18 |
|
|
|
0.065 |
|
| Issued |
|
|
15,854,308 |
|
|
|
|
|
|
|
|
|
| Exercised |
|
|
(550,000 |
) |
|
|
|
|
|
|
|
|
| Outstanding, April 30, 2015 |
|
|
72,969,908 |
|
|
|
|
|
|
|
|
|
| Exercisable, April 30, 2015 |
|
|
72,969,908 |
|
|
$ |
0.17 |
|
|
$ |
0.075 |
|
|
| Schedule of warrants outstanding and exercisable |
| Range of Exercise Prices |
|
Number of Warrant
Shares Exercisable at 04/30/2015 |
|
|
Weighted Average
Remaining Contractual Life |
|
|
Exercisable Weighted
Average Exercise Price |
|
| $0.075, $0.11, $0.12, $0.18 and $0.25 |
|
|
72,969,908 |
|
|
|
2.86 |
|
|
|
0.17 |
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
| Five Year Term - $0.075 |
|
|
1,056,000 |
|
|
|
2.45 |
|
|
|
|
|
| Five Year Term - $0.12 |
|
|
18,347,508 |
|
|
|
2.75 |
|
|
|
|
|
| Five Year Term - $0.18 |
|
|
19,811,200 |
|
|
|
2.67 |
|
|
|
|
|
| Five Year Term - $0.25 |
|
|
18,755,200 |
|
|
|
2.68 |
|
|
|
|
|
| Five Year Term - $0.11 |
|
|
10,000,000 |
|
|
|
4.90 |
|
|
|
|
|
| Nine Month Term - $0.11 |
|
|
5,000,000 |
|
|
|
0.67 |
|
|
|
|
|
| |
|
|
72,969,908 |
|
|
|
|
|
|
|
|
|
|