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Note 18 – Derivatives (Tables) | 3 Months Ended
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Jul. 31, 2022
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
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|  |  | July 31, 2022 |  |  |  | April 30, 2022 |
Risk-free interest rate |  |  | 2.83% |  |  |  | 0.52 – 2.87% |
Expected dividend yield |  |  | — |  |  |  | — |
Expected term (in years) |  |  | 3.17 – 3.50 |  |  |  | 3.42 – 4.50 |
Expected volatility |  |  | 225.77 – 235.23% |  |  |  | 211.02 – 292.28% |
Schedule of Derivative Liabilities at Fair Value [Table Text Block] |
|  | July 31, 2022 |  | April 30, 2022
Balance, beginning of period |  | $ | 1,607,497 |  |  | $ | 2,812,767 |
Additions |  |  | — |  |  |  | — |
Eliminated upon conversion of notes/exercise of warrants |  |  | — |  |  |  | (163,141 | )
Changes in fair value |  |  | 92,922 |  |  |  | (1,042,129 | )
Balance, end of period |  | $ | 1,700,419 |  |  | $ | 1,607,497 |
Changes in fair value primarily relate to changes in the Company’s stock price during the period with increases in the stock price increasing the liability and decreases in the stock price reducing the liability.

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