Quarterly report pursuant to Section 13 or 15(d)

The estimated fair value of stock options granted to employees and consultants during the six months ended October 31, 2021 and 2020, were calculated using the Black-Scholes option-pricing model using the following assumptions: (Details)

v3.21.2
The estimated fair value of stock options granted to employees and consultants during the six months ended October 31, 2021 and 2020, were calculated using the Black-Scholes option-pricing model using the following assumptions: (Details)
6 Months Ended
Oct. 31, 2021
Oct. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Dividend Yield 0.00% 0.00%
Employees And Consultants [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Volatility 86.31%  
Minimum [Member] | Employees And Consultants [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected Term (in years) 2 years 6 months  
Risk-free interest rate 1.01%  
Maximum [Member] | Employees And Consultants [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected Term (in years) 5 years 6 years 3 months
Volatility   10010.00%
Risk-free interest rate 1.07% 51.00%