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Note 2 - Investments - Schedule of Carrying Value and Fair Value of Equity Securities (Details) - USD ($)	Oct. 31, 2024	Apr. 30, 2024
Equity securities, cost	$ 15,505,000	$ 11,663,000
Equity securities, fair value	21,837,000	16,344,000
Exchange Traded Funds [Member]
Equity securities, cost	15,505,000	11,663,000
Equity securities, gross unrealized gains	6,337,000	4,685,000
Equity securities, gross unrealized losses	(5,000)	(4,000)
Equity securities, fair value	$ 21,837,000	$ 16,344,000

X

- 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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