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Note 17 – Share Based Awards (Tables) | 12 Months Ended
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Apr. 30, 2022
Share-Based Payment Arrangement [Abstract] |
[custom:ScheduleOfAssumptionsUsed1TableTextBlock] |
|  |  | 2022 |  |  |  | 2021 |
Exercise Price |  |  | $ 1.69 – 2.82 |  |  |  | $ 2.01 – 3.95 |
Stock price on date of grant |  |  | 1.69 – 2.82 |  |  |  | 2.01 – 3.95 |
Risk-free interest rate |  |  | 0.47 – 1.91% |  |  |  | 0.38 – 1.66% |
Dividend yield |  |  | — |  |  |  | — |
Expected term (years) |  |  | 3.75 – 10.00 |  |  |  | 5.87 – 10.00 |
Volatility |  |  | 210.68 – 273.46% |  |  |  | 88.60 – 91.44% |
Disclosure of Share-Based Compensation Arrangements by Share-Based Payment Award [Table Text Block] |
Options |  | Shares |  | Weighted-Average Exercise Price |  | Weighted-Average Remaining Contractual Term |  | Aggregate Intrinsic Value
Outstanding as of April 30, 2020 |  |  | 1,597,475 |  |  | $ | 1.10 |  |  |  |  |  |  |  |  |
Granted |  |  | 600,000 |  |  |  | 3.63 |  |  |  |  |  |  |  |  |
Exercised |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Forfeited or expired |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Outstanding as of April 30, 2021 |  |  | 2,197,475 |  |  |  | 1.79 |  |  |  | 8.68 |  |  |  | 4,943,870 |
Granted |  |  | 1,681,000 |  |  |  | 2.58 |  |  |  |  |  |  |  |  |
Exercised |  |  | (150,000 | ) |  |  | 2.49 |  |  |  |  |  |  |  |  |
Forfeited or expired |  |  | (34,333 | ) |  |  | 2.11 |  |  |  |  |  |  |  |  |
Outstanding as of April 30, 2022 |  |  | 3,694,142 |  |  |  | 2.17 |  |  |  | 8.56 |  |  |  | 1,407,545 |
Exercisable as of April 30, 2022 |  |  | 2,094,642 |  |  | $ | 1.90 |  |  |  | 7.91 |  |  | $ | 1,058,620 |
Share-Based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block] |
Restricted Stock |  | Shares |  | Weighted Average Grant-Date Fair Value Per Share
Unvested and outstanding as of April 30, 2020 |  |  | — |  |  | $ | — |
Granted |  |  | 1,000,000 |  |  |  | 2.69 |
Vested |  |  | (312,500 | ) |  |  | 2.69 |
Forfeited |  |  | — |  |  |  | — |
Unvested and outstanding as of April 30, 2021 |  |  | 687,500 |  |  |  | 2.69 |
Granted |  |  | 995,659 |  |  |  | 2.55 |
Vested |  |  | (599,484 | ) |  |  | 2.64 |
Forfeited |  |  | — |  |  |  | — |
Unvested and outstanding as of April 30, 2022 |  |  | 1,083,675 |  |  | $ | 2.59 |
Schedule of Deferred Compensation Arrangement with Individual, Share-Based Payments [Table Text Block] |
|  | 2022 |  | 2021
General and administrative |  | $ | 1,521,951 |  |  | $ | 1,688,025 |
Research and development |  |  | 516,456 |  |  |  | 1,269,987 |
Operations |  |  | 783,781 |  |  |  | 220,048 |
Sales and marketing |  |  | 469,447 |  |  |  | 210,156 |
Total |  | $ | 3,291,635 |  |  | $ | 3,388,216 |

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