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Note 2 – Summary of Significant Accounting Policies (Tables)
6 Months Ended
Oct. 31, 2022
Accounting Policies [Abstract]  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
   October 31, 2022  April 30, 2022
Series B Preferred Stock, as converted   822,230    822,230 
Stock options   3,994,558    3,694,142 
Warrants   1,539,999    1,539,999 
Restricted stock   1,106,514    1,083,675 
Total   7,463,301    7,140,046