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Note 2 - Investments (Details Textual) - USD ($)	3 Months Ended				6 Months Ended
	Oct. 31, 2024	Jul. 31, 2024	Oct. 31, 2023	Jul. 31, 2023	Oct. 31, 2024	Oct. 31, 2023	Apr. 30, 2024
Equity Securities, FV-NI, Cost	$ 15,505,000				$ 15,505,000		$ 11,663,000
Equity securities	21,837,000				21,837,000		16,344,000
Proceeds from Sale of Equity Securities, FV-NI					3,075,000	$ 999,000
Other Comprehensive Income (Loss), Available-for-Sale Securities Adjustment, Net of Tax, Portion Attributable to Parent	2,000	$ 177,000	$ (448,000)	$ (212,000)	179,000	(660,000)
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, Tax					48,000	(177,000)
Equity Securities, FV-NI, Gain (Loss)					(127,000)	18,000
Equity Method Investments	60,786,000				60,786,000		60,134,000
EAM Trust [Member]
Fair Value of Contributed Capital at Inception	55,805,000				55,805,000		5,820,000
Cash and Liquid Securities in Excess of Working Capital Requirements Contributed to Capital Account							5,820,000
Equity Method Investment, Other than Temporary Impairment					$ 0	0
Percentage of Non Voting Profit Interest					50.00%
Accrued Non Voting Revenues and Non Voting Profits Interests Payable	4,572,000				$ 4,572,000		3,865,000
Fixed Income Securities [Member]
Proceeds from Sale and Maturity of Debt Securities, Available-for-Sale					22,365,000	19,265,000
AOCI, Debt Securities, Available-for-Sale, Adjustment, after Tax	$ 94,000				94,000		$ 320,000
Other Comprehensive Income (Loss), Available-for-Sale Securities Adjustment, Net of Tax, Portion Attributable to Parent					(227,000)	793,000
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, Tax					$ 48,000	$ 166,000
Debt Securities, Available-for-Sale, Weighted Average Yield	4.40%				4.40%		4.40%
Fixed Income Securities [Member] | AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]
AOCI Tax, Attributable to Parent	$ 20,000				$ 20,000		$ 67,000

X

- Definition

Amount, after tax, of accumulated unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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Weighted average yield of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of other-than-temporary decline in value that has been recognized against investment accounted for under equity method of accounting.

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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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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Amount of unrealized and realized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Amount, before adjustment, of tax expense (benefit) for unrealized holding gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Excludes tax expense (benefit) for unrealized gain (loss) on investment in debt security measured at amortized cost (held-to-maturity) from transfer to available-for-sale.

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Amount of cash inflow from sale, maturity, prepayment and call of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of cash inflow from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as investing activity.

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Sum of the carrying values as of the balance sheet date of accrued payable non-voting revenues and non-voting profits interests.

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Represents the cash and liquid securities in excess of working capital requirements contributed to capital account.

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