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Note 2 - Investments - Schedule of Carrying Value and Fair Value of Equity Securities (Details) - USD ($) | Jul. 31, 2024 | Apr. 30, 2024
--- | --- | ---
Equity securities, cost | $ 16,093,000 | $ 11,663,000
Equity securities | 21,724,000 | 16,344,000
Exchange Traded Funds [Member] |  |
Equity securities, cost | 16,093,000 | 11,663,000
Equity securities, gross unrealized gains | 5,801,000 | 4,685,000
Equity securities, gross unrealized losses | (170,000) | (4,000)
Equity securities | $ 21,724,000 | $ 16,344,000

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