Share Based Awards - Stock compensation expense (Details) - USD ($) |
3 Months Ended | 9 Months Ended |
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Jan. 31, 2021 |
Jan. 31, 2021 |
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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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