Quarterly report pursuant to Section 13 or 15(d)

Summary of shares of common stock issued (Details)

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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