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Note 4 - Investments - Schedule of Carrying Value and Fair Value of Equity Securities (Details) - USD ($)	Apr. 30, 2025	Apr. 30, 2024
Equity Securities, FV-NI, Cost	$ 15,513,000	$ 11,663,000
Equity securities	20,879,000	16,344,000
Exchange Traded Funds [Member]
Equity Securities, FV-NI, Cost	15,513,000	11,663,000
ETFs - equities	5,450,000	4,685,000
ETFs - equities	(84,000)	(4,000)
Equity securities	$ 20,879,000	$ 16,344,000

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- Definition

Cost of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). Excludes equity method investment and investment in equity security without readily determinable fair value.

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