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Note 2 - Investments - Schedule of Carrying Value and Fair Value of Equity Securities (Details) - USD ($) | Oct. 31, 2022 | Apr. 30, 2022
--- | --- | ---
Equity securities, cost | $ 13,212,000 | $ 13,318,000
Equity securities, fair value | 17,122,000 | 17,647,000
Exchange Traded Funds [Member] |  |
Equity securities, cost | 13,212,000 | 13,318,000
Equity securities, gross unrealized gains | 3,956,000 | 4,348,000
Equity securities, gross unrealized losses | (46,000) | (19,000)
Equity securities, fair value | $ 17,122,000 | $ 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 -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 1A -URI https://asc.fasb.org/extlink&oid=123594786&loc=SL75136599-209740 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(2)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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