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Note 16 – Warrants (Tables)
6 Months Ended
Oct. 31, 2022
Note 16 Warrants  
[custom:ScheduleOfStockholdersEquityNoteWarrantsOrRights1TextBlock]
   Upon Issuance  Outstanding at October 31, 2022
Date of Transaction  Number of Warrants  Initial Fair Value  Number of Warrants  Fair Value
 October 2020     399,998   $267,999    266,666   $330,493 
 January 2021    675,000   $2,870,666    540,000   $683,182 
Defined Benefit Plan, Assumptions [Table Text Block]
    2022    2021 
Risk-free interest rate          0.790.85% 
Expected dividend yield            
Expected term (in years)    —      5.00 
Expected volatility         222.45223.17% 
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
   

 

Number of Shares 

 

 

Weighted-average Exercise Price per Share

 

 Weighted-average Remaining Contractual Term

(in years) 

 

 

Aggregate Intrinsic Value 

  Balance as of April 30, 2021 873,332     1.50        4.62     2,218,263  
  Granted     733,333      $ 5.45                  
  Exercised     (66,666 )     1.50                  
  Outstanding as of April 30, 2022 1,539,999     3.38       3.89     $ 427,533  
  Granted                            
  Exercised                           
  Outstanding at October 31, 2022 1,539,999    $ 3.38       3.38     $