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Note 16 – Warrants (Tables)
12 Months Ended
Apr. 30, 2022
Note 16 Warrants  
Defined Benefit Plan, Assumptions [Table Text Block]
    2022    2021 
Risk-free interest rate   0.790.85%    0.522.87% 
Expected dividend yield            
Expected term (in years)    5.00 5.00    3.42 4.50 
Expected volatility    222.45223.17%    211.02 292.28% 

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, 2020                  —           
  Granted     1,074,998      $ 1.50                  
  Exercised     (201,666 )     1.50                  
  Outstanding 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 at April 30, 2022 1,539,999    $ 3.38       3.89     $ 427,533