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Stock compensation expense (Details) - USD ($)
 12 Months Ended
Apr. 30, 2022
Apr. 30, 2021
Share-Based Payment Arrangement [Abstract]    
General and administrative $ 1,521,951 $ 1,688,025
Research and development 516,456 1,269,987
Operations 783,781 220,048
Sales and marketing 469,447 210,156
 Total $ 3,291,635 $ 3,388,216