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Note 1 - Organization and Summary of Significant Accounting Policies - Schedule of Fair Value Measurements of Investments (Details) - USD ($) | Apr. 30, 2024 | Apr. 30, 2023
--- | --- | ---
Cash equivalents | $ 4,136,000 | $ 7,240,000
Equity Securities, FV-NI | 16,344,000 | 14,546,000
Available-for-sale fixed income securities | 47,611,000 | 39,928,000
Investments, Fair Value Disclosure | 68,091,000 | 61,714,000
Fair Value, Inputs, Level 1 [Member] |  |
Cash equivalents | 4,136,000 | 7,240,000
Equity Securities, FV-NI | 16,344,000 | 14,546,000
Available-for-sale fixed income securities | 47,361,000 | 39,178,000
Investments, Fair Value Disclosure | 67,841,000 | 60,964,000
Fair Value, Inputs, Level 2 [Member] |  |
Cash equivalents | 0 | 0
Equity Securities, FV-NI | 0 | 0
Available-for-sale fixed income securities | 250,000 | 750,000
Investments, Fair Value Disclosure | 250,000 | 750,000
Fair Value, Inputs, Level 3 [Member] |  |
Cash equivalents | 0 | 0
Equity Securities, FV-NI | 0 | 0
Available-for-sale fixed income securities | 0 | 0
Investments, Fair Value Disclosure | $ 0 | $ 0

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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