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Note 4 - Investments - Schedule of Carrying Value and Fair Value of Equity Securities (Details) - USD ($) | Apr. 30, 2023 | Apr. 30, 2022
--- | --- | ---
Equity securities, cost | $ 10,169,000 | $ 13,318,000
Equity securities, fair value | 14,546,000 | 17,647,000
Exchange Traded Funds [Member] |  |
Equity securities, cost | 10,169,000 | 13,318,000
Equity securities, gross unrealized gains | 4,392,000 | 4,348,000
Equity securities, gross unrealized losses | (15,000) | (19,000)
Equity securities, fair value | $ 14,546,000 | $ 17,647,000

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- Definition Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1A -Publisher FASB -URI https://asc.fasb.org//1943274/2147482736/825-10-45-1A + Details
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