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Note 14 – Common Stock (Tables)
 3 Months Ended
Jul. 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 33,267 to pay taxes and 9,000 to repay a Note   55,915 
Vesting of restricted stock units to Board of Directors   12,032 
Vesting of restricted stock units to consultants   1,760 
Share outstanding as of July 31, 2022   53,818,442