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Stock compensation expense by functional category (Details) - USD ($)
3 Months Ended
Jul. 31, 2023
Jul. 31, 2022
Share-Based Payment Arrangement [Abstract]    
General and administrative $ 427,781 $ 345,168
Research and development 127,417 144,798
Operations 191,099 158,431
Sales and marketing 165,309 107,074
 Total $ 911,606 $ 755,471