Quarterly report pursuant to Section 13 or 15(d)

STOCK OPTIONS AND WARRANTS (Details - Option Assumptions)

v3.21.2
STOCK OPTIONS AND WARRANTS (Details - Option Assumptions) - Employee Options [Member]
3 Months Ended
Jul. 31, 2021
Jul. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Risk-free interest rate 0.87% 0.30%
Expected volatility 113.00% 91.00%
Expected lives (years) 2 years 6 months 2 years 6 months
Expected dividend yield 0.00% 0.00%