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Note 1 - Organization and Summary of Significant Accounting Policies - Fair Value Measurements (Details) - USD ($) | Jul. 31, 2024 | Apr. 30, 2024
--- | --- | ---
Cash equivalents | $ 15,248,000 | $ 4,136,000
Equity securities | 21,724,000 | 16,344,000
Available-for-sale fixed income securities | 33,928,000 | 47,611,000
Investments, Fair Value Disclosure | 70,900,000 | 68,091,000
Fair Value, Inputs, Level 1 [Member] |  |
Cash equivalents | 15,248,000 | 4,136,000
Equity securities | 21,724,000 | 16,344,000
Available-for-sale fixed income securities | 33,928,000 | 47,361,000
Investments, Fair Value Disclosure | 70,900,000 | 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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