Quarterly report pursuant to Section 13 or 15(d)

Note 12 - Derivatives (Tables)

v3.21.2
Note 12 - Derivatives (Tables)
3 Months Ended
Jul. 31, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
   
Risk-free interest rate     0.52 - 0.69
Expected dividend yield     -    
Expected term (in years)     4.17 - 4.50  
Expected volatility     211.02 - 219.34 %
Schedule of Derivative Liabilities at Fair Value [Table Text Block]
     
  Derivative liability at April 30, 2021     $ 2,812,767  
  Eliminated upon exercise of warrants       (163,141 )
  Changes in fair value, primarily related to decrease in Company's stock price       (154,248 )
  Derivative liability at July 31, 2021     $ 2,495,378