Quarterly report pursuant to Section 13 or 15(d)

The estimated fair value of warrants granted during the nine months ended January 31, 2022 and 2021, were calculated using the Black-Scholes option-pricing model using the following assumptions: (Details)

v3.22.0.1
The estimated fair value of warrants granted during the nine months ended January 31, 2022 and 2021, were calculated using the Black-Scholes option-pricing model using the following assumptions: (Details) - Number
Jan. 31, 2022
Jan. 31, 2021
Expected term (in years) 3 years 1 month 6 days  
Warrant [Member]    
Expected term (in years) 5 years 5 years
Warrant [Member] | Measurement Input, Option Volatility [Member]    
Warrants measurement input 86.31 103.70
Warrant [Member] | Measurement Input, Risk Free Interest Rate [Member] | Minimum [Member]    
Warrants measurement input 0.87 0.27
Warrant [Member] | Measurement Input, Risk Free Interest Rate [Member] | Maximum [Member]    
Warrants measurement input 0.90 0.28
Warrant [Member] | Measurement Input, Expected Dividend Rate [Member] | Minimum [Member]    
Warrants measurement input 0.00 0.00