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Note 2 - Investments - Schedule of Carrying Value and Fair Value of Equity Securities (Details) - USD ($) | Jan. 31, 2022 | Apr. 30, 2021
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Equity securities, cost | $ 22,746,000 | $ 19,105,000
Equity securities, fair value | 27,316,000 | 23,582,000
Exchange Traded Funds [Member] |  |
Equity securities, cost | 22,746,000 | 19,105,000
Equity securities, gross unrealized gains | 4,724,000 | 4,532,000
Equity securities, gross unrealized losses | (154,000) | (55,000)
Equity securities, fair value | $ 27,316,000 | $ 23,582,000

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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 http://asc.fasb.org/extlink&oid=123594786&loc=SL75136599-209740 + Details
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- Definition Amount of accumulated unrealized gain on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References No definition available. + Details
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- Definition Amount of accumulated gross unrealized loss on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References No definition available. + Details
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