Quarterly report pursuant to Section 13 or 15(d)

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

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6. STOCK OPTIONS AND WARRANTS (Details - Option Assumptions) - Employee Options [Member]
6 Months Ended
Oct. 31, 2020
Oct. 31, 2019
Risk-free interest rate 0.30% 2.00%
Expected volatility 92.00% 91.00%
Expected lives (years) 2 years 6 months 2 years 6 months
Expected dividend yield 0.00% 0.00%