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Note 16 - Derivatives (Tables) | 6 Months Ended
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Oct. 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 |  |  | 0.75 - 0.97% |
Expected dividend yield |  |  | — |
Expected term (in years) |  |  | 3.92 - 4.24 |
Expected volatility |  |  | 272.54 – 292.28% |
Changes in the derivative liability | As of October 31, 2021, all of the notes had been converted into common stock and 806,666 of the warrants were outstanding. Changes in the derivative liability during the three and six months ended October 31, 2021 were as follows:
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 |
Eliminated upon exercise of warrants |  |  | — |
Changes in fair value, primarily related to decrease in Company's stock price |  |  | (118,813 | )
Derivative liability at October 31, 2021 |  | $ | 2,376,565 |

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