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Note 7 – Intangible Assets (Tables)
 3 Months Ended
Jul. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Intangible Assets and Goodwill [Table Text Block]
                          
      July 31, 2022  April 30, 2022
   Gross Value  Accumulated Amortization  Net Value  Accumulated Amortization  Net Value
Proprietary technology  $1,098,000    (267,284)  $830,716   $(219,267)  $878,733 
Non-compete agreements   81,000    (36,417)   44,583    (29,667)   51,333 
Customer relationships   39,000    (13,928)   25,072    (12,535)   26,465 
Total finite-lived assets   1,218,000    (317,629)   900,371    (261,469)   956,531 
Brand name   1,722,000    —      1,722,000    —      1,722,000 
Trademark   20,000    —      20,000    —      20,000 
Total indefinite-lived assets   1,742,000    —      1,742,000    —      1,742,000 
Total intangible assets, net  $2,960,000    (317,629)  $2,642,371   $(261,469)  $2,698,531 
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]
Fiscal Year Ended:   
 2023   $168,478 
 2024    221,972 
 2025    197,638 
 2026    170,438 
 2027    141,845 
 Total   $900,371 
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   14,294,499 
 Balance at April 30, 2022 and July 31, 2022      $25,138,750