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Note 12 - Derivatives (Tables) | 3 Months Ended
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Jul. 31, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] |
Risk-free interest rate |  |  | 0.52 - 0.69 | %
Expected dividend yield |  |  | - |
Expected term (in years) |  |  | 4.17 - 4.50 |
Expected volatility |  |  | 211.02 - 219.34 | %
Schedule of Derivative Liabilities at Fair Value [Table Text Block] |
| Derivative liability at April 30, 2021 |  |  | $ | 2,812,767 |
| Eliminated upon exercise of warrants |  |  |  | (163,141 | )
| Changes in fair value, primarily related to decrease in Company's stock price |  |  |  | (154,248 | )
| Derivative liability at July 31, 2021 |  |  | $ | 2,495,378 |

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