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Summary of shares of common stock issued (Details) - Common Stock [Member] - shares | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2022 | Jul. 31, 2021 | Apr. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Shares, Outstanding, Beginning Balance | 53,748,735 | 29,431,264 | 29,431,264
Conversion of Series A preferred stock |  |  | 1,321,996
Conversion of Series B preferred stock |  |  | 818,333
Exercise of warrants |  | 66,666 | 66,666
Acquisition of Skypersonic on May 7, 2021, see Note 1 |  | 685,321 | 707,293
Acquisition of Teal Drones on August 31, 2021, see Note 1 |  |  | 3,588,272
Public offerings which generated gross proceeds of $76 million and net proceeds of approximately $70.1 million |  | 17,333,334 | 17,333,334
Exercise of stock options |  |  | 89,107
Vesting of restricted stock units to employees, net of shares withheld of 33,267 to pay taxes and 9,000 to repay a Note | 55,915 |  | 225,637
Vesting of restricted stock units to Board of Directors | 12,032 |  | 48,124
Vesting of restricted stock units to consultants | 1,760 |  | 7,042
Shares issued for services |  | 91,667 | 111,667
Shares, Outstanding, Ending Balance | 53,818,442 | 48,489,085 | 53,748,735

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