Stock compensation expense (Details) - USD ($) |
3 Months Ended | |
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Jul. 31, 2022 |
Jul. 31, 2021 |
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Share-Based Payment Arrangement [Abstract] | ||
General and administrative | $ 345,168 | $ 219,601 |
Research and development | 144,798 | 56,480 |
Operations | 158,431 | 63,261 |
Sales and marketing | 107,074 | 44,744 |
Total | $ 755,471 | $ 384,086 |
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