Quarterly report pursuant to Section 13 or 15(d)

Note 17 - Derivatives (Tables)

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Note 17 - Derivatives (Tables)
9 Months Ended
Jan. 31, 2022
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     1.391.39%  
Expected dividend yield         
Expected term (in years)     3.673.99  
Expected volatility     245.10249.99%  
Schedule of Derivative Liabilities at Fair Value [Table Text Block]
         
   

Three months ended

January 31,

 

Nine months ended

January 31,

    2022   2021   2022   2021
Balance, beginning of period   $ 2,376,565     $ 812,390     $ 2,812,767     $    
Additions             4,981,701               5,710,288  
Eliminated upon exercise of warrants                     (163,141)          
Changes in fair value     (1,026,466)       3,350,135       (1,299,527)       3,433,938  
Balance, end of period   $ 1,350,099     $ 9,144,226     $ 1,350,099     $ 9,144,226