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Stock compensation expense by functional category (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jan. 31, 2024 | Jan. 31, 2023 | Jan. 31, 2024 | Jan. 31, 2023
Share-Based Payment Arrangement [Abstract] |  |  |  |
Operations | $ 114,425 | $ 181,908 | $ 544,046 | $ 566,218
Research and development | (106,314) | 170,579 | 168,732 | 524,874
Sales and marketing | 120,180 | 120,733 | 494,392 | 390,076
General and administrative | 457,480 | 315,471 | 1,486,532 | 1,309,790
Total | $ 585,771 | $ 788,691 | $ 2,693,702 | $ 2,790,958

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