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Note 18 – Derivatives (Tables)
 12 Months Ended
Apr. 30, 2022
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
[custom:ScheduleOfAssumptionsUsed2TableTextBlock]
    April 30, 2022    April 30, 2021 
Risk-free interest rate   0.52 – 2.87%    0.08 – 0.61% 
Expected dividend yield   —      —   
Expected term (in years)    3.42 – 4.50    1.54 – 5.00 
Expected volatility    211.02 – 292.28%    86.74 – 110.56% 
Schedule of Derivative Liabilities at Fair Value [Table Text Block]
   2022  2021
Balance, beginning of period  $2,812,767   $—   
Additions   —      5,710,288 
Eliminated upon conversion of notes/exercise of warrants   (163,141)   (5,390,415)
Changes in fair value   (1,042,129)   2,492,894 
Balance, end of period  $1,607,497   $2,812,767