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Note 2 – Summary of Significant Accounting Policies (Tables)
3 Months Ended
Jul. 31, 2022
Accounting Policies [Abstract]  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
   July 31, 2022  April 30, 2022
Series B Preferred Stock, as converted   822,230    822,230 
Stock options   3,634,142    3,694,142 
Warrants   1,539,999    1,539,999 
Restricted stock   971,701    1,083,675 
Total   6,968,072    7,140,046