Note 17 - Derivatives (Tables)
|9 Months Ended|
Jan. 31, 2022
|Derivative Instruments and Hedging Activities Disclosure [Abstract]|
|Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]||
|Schedule of Derivative Liabilities at Fair Value [Table Text Block]||
Tabular disclosure of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset) using recurring unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.
Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef