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Note 14 – Common Stock (Tables) | 6 Months Ended
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Oct. 31, 2022
Equity [Abstract] |
Schedule of Common Stock Outstanding Roll Forward [Table Text Block] |
Description of Shares |  | Shares Issued
Shares outstanding as of April 30, 2021 |  |  | 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 |
Acquisition of Skypersonic on May 7, 2021, see Note 1 |  |  | 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 |
Exercise of stock options |  |  | 89,107 |
Vesting of restricted stock units to employees, net of shares withheld of 225,869 to pay taxes and 92,812 to repay a Note |  |  | 225,637 |
Vesting of restricted stock units to Board of Directors |  |  | 48,124 |
Vesting of restricted stock units to consultants |  |  | 7,042 |
Shares issued for services |  |  | 111,667 |
Shares outstanding as of April 30, 2022 |  |  | 53,748,735 |
Vesting of restricted stock units to employees, net of shares withheld of 512,643 to pay taxes and 9,000 to repay a Note |  |  | 446,325 |
Vesting of restricted stock units to Board of Directors |  |  | 30,078 |
Vesting of restricted stock units to consultants |  |  | 4,401 |
Share outstanding as of October 31, 2022 |  |  | 54,229,539 |

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