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Note 2 – Summary of Significant Accounting Policies (Tables)
3 Months Ended
Jul. 31, 2023
Accounting Policies [Abstract]  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
   July 31, 2023  April 30, 2023
Series B Preferred Stock, as converted   3,896    822,230 
Stock options   6,884,017    4,784,809 
Warrants   1,539,999    1,539,999 
Restricted stock   842,701    781,060 
Total   9,270,613    7,928,098