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Note 5 – Other Current Assets (Tables)
3 Months Ended
Jul. 31, 2022
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Schedule of Other Current Assets [Table Text Block]
   July 31, 2022  April 30, 2022
Prepaid inventory  $1,804,539   $1,707,085 
Accrued interest income   334,654    385,730 
Prepaid expenses   555,080    262,069 
Total  $2,694,273   $2,354,884