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Note 7 – Intangible Assets (Tables)
 6 Months Ended
Oct. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Intangible Assets and Goodwill [Table Text Block]
                      
   October 31, 2022  April 30, 2022
   Gross Value  Accumulated Amortization  Net Value 

Gross

Value

  Accumulated Amortization  Net Value
Proprietary technology  $4,967,000    (422,773)  $4,544,227   $1,098,000   $(219,267)  $878,733 
Non-compete agreements   81,000    (43,166)   37,834    81,000    (29,667)   51,333 
Customer relationships   39,000    (15,320)   23,680    39,000    (12,535)   26,465 
Total finite-lived assets   5,087,000    (481,259)   4,605,741    1,218,000    (261,469)   956,531 
Brand name   3,152,000    —      3,152,000    1,722,000    —      1,722,000 
Trademark   20,000    —      20,000    20,000    —      20,000 
Total indefinite-lived assets   3,172,000    —      3,172,000    1,742,000    —      1,742,000 
Total intangible assets, net  $8,259,000   $(481,259)  $7,777,741   $2,960,000   $(261,469)  $2,698,531 
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]
Fiscal Year Ended:   
 2023   $434,738 
 2024    866,805 
 2025    842,471 
 2026    815,271 
 2027    786,679 
 Thereafter    859,777 
 Total   $4,605,741 
Schedule of Goodwill [Table Text Block]
  Date  Acquisition  Goodwill
 January 2020   Rotor Riot  $1,849,073 
 November 2020   Fat Shark   6,168,260 
 Balance at April 30, 2021       8,017,333 
 May 2021   Skypersonic   2,826,918 
 August 2021   Teal Drones   8,995,499 
 Balance at April 30, 2022 and October 31, 2022      $19,839,750