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Note 1 - Organization and Summary of Significant Accounting Policies - Schedule of Fair Value Measurements of Investments (Details) - USD ($)	Apr. 30, 2025	Apr. 30, 2024
Cash equivalents	$ 33,615,000	$ 4,136,000
Equity securities	20,879,000	16,344,000
Available-for-sale fixed income securities	22,435,000	47,611,000
Investments, Fair Value Disclosure	76,929,000	68,091,000
Fair Value, Inputs, Level 1 [Member]
Cash equivalents	33,615,000	4,136,000
Equity securities	20,879,000	16,344,000
Available-for-sale fixed income securities	22,435,000	47,361,000
Investments, Fair Value Disclosure	76,929,000	67,841,000
Fair Value, Inputs, Level 2 [Member]
Cash equivalents	0	0
Equity securities	0	0
Available-for-sale fixed income securities	0	250,000
Investments, Fair Value Disclosure	0	250,000
Fair Value, Inputs, Level 3 [Member]
Cash equivalents	0	0
Equity securities	0	0
Available-for-sale fixed income securities	0	0
Investments, Fair Value Disclosure	$ 0	$ 0

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Amount 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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