Quarterly report pursuant to Section 13 or 15(d)

5. STOCK OPTIONS AND WARRANTS (Details - Option Assumptions)

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5. STOCK OPTIONS AND WARRANTS (Details - Option Assumptions)
6 Months Ended
Oct. 31, 2018
Oct. 31, 2017
Employee Options [Member]    
Risk-free interest rate 2.00%
Expected volatility 107.00%
Expected lives (years)   2 years 6 months
Expected dividend yield 0.00%
Non-Employee Options [Member]    
Risk-free interest rate 2.80% 1.80%
Expected volatility 97.00% 108.00%
Expected lives (years) 4 years 10 months 6 days 5 years
Expected dividend yield 0.00% 0.00%