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] |
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| 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:
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