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Note 1 - Organization and Summary of Significant Accounting Policies (Details Textual) - USD ($) | 3 Months Ended |
--- | --- | ---
Jul. 31, 2025 | Apr. 30, 2025
Investments, Fair Value Disclosure | $ 80,918,000 | $ 76,929,000
Liabilities, Fair Value Disclosure | 0 |
Money Market Funds, at Carrying Value | 33,430,000 | 33,615,000
Fair Value, Inputs, Level 3 [Member] |  |
Investments, Fair Value Disclosure | $ 0 | $ 0
EAM Trust [Member] |  |
Non Voting Profits Interest Percent | 50.00% |
EAM Trust [Member] | Minimum [Member] |  |
Non Voting Revenues Interest Percent | 41.00% |
Percentage of Non Voting Profits Interests Due from Ex Subsidiary Payable to Parent under Agreement | 90.00% |
EAM Trust [Member] | Maximum [Member] |  |
Non Voting Revenues Interest Percent | 55.00% |

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