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Note 7 – Intangible Assets (Tables) | 12 Months Ended
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Apr. 30, 2022
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Intangible Assets and Goodwill [Table Text Block] |
| April 30, 2022 |  | April 30, 2021
| Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Value |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Value
Proprietary technology | $ | 1,098,000 |  |  | $ | (219,267 | ) |  | $ | 878,733 |  |  | $ | 272,000 |  |  | $ | (27,200 | ) |  | $ | 244,800 |
Non-compete agreements |  | 81,000 |  |  |  | (29,667 | ) |  |  | 51,333 |  |  |  | 16,000 |  |  |  | (2,667 | ) |  |  | 13,333 |
Customer relationships |  | 39,000 |  |  |  | (12,535 | ) |  |  | 26,465 |  |  |  | 39,000 |  |  |  | (6,964 | ) |  |  | 32,036 |
Total finite-lived assets |  | 1,218,000 |  |  |  | (261,469 | ) |  |  | 956,531 |  |  |  | 327,000 |  |  |  | (36,831 | ) |  |  | 290,169 |
Brand name |  | 1,722,000 |  |  |  | — |  |  |  | 1,722,000 |  |  |  | 1,722,000 |  |  |  | — |  |  |  | 1,722,000 |
Trademark |  | 20,000 |  |  |  | — |  |  |  | 20,000 |  |  |  | 20,000 |  |  |  | — |  |  |  | 20,000 |
Total indefinite-lived assets |  | 1,742,000 |  |  |  | — |  |  |  | 1,742,000 |  |  |  | 1,742,000 |  |  |  | — |  |  |  | 1,742,000 |
Total intangible assets, net | $ | 2,960,000 |  |  | $ | (261,469 | ) |  | $ | 2,698,531 |  |  | $ | 2,069,000 |  |  | $ | (36,831 | ) |  | $ | 2,032,169 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] |
| Fiscal Year Ended: |  |
| 2023 |  |  | $ | 224,638 |
| 2024 |  |  |  | 221,972 |
| 2025 |  |  |  | 197,638 |
| 2026 |  |  |  | 170,438 |
| 2027 |  |  |  | 141,845 |
| Total |  |  | $ | 956,531 |
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 |  |  |  |  |  | $ | 25,138,750 |

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