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v3.21.1

Share Based Awards - Stock compensation expense (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jan. 31, 2021 | Jan. 31, 2021
Share-based Payment Arrangement [Abstract] |  |
General and administrative | $ 336,301 | $ 525,559
Research and development | 179,157 | 199,047
Operations | 170,612 | 175,586
Sales and marketing | 168,125 | 168,125
Total | $ 854,195 | $ 1,068,317

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