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Note 2 - Investments - Schedule of Carrying Value and Fair Value of Equity Securities (Details) - USD ($) | Jul. 31, 2023 | Apr. 30, 2023
--- | --- | ---
Equity securities, cost | $ 10,162,000 | $ 10,169,000
Equity securities, fair value | 14,765,000 | 14,546,000
Exchange Traded Funds [Member] |  |
Equity securities, cost | 10,162,000 | 10,169,000
Equity securities, gross unrealized gains | 4,603,000 | 4,392,000
Equity securities, gross unrealized losses | 0 | (15,000)
Equity securities, fair value | $ 14,765,000 | $ 14,546,000

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