Note 2 - Investments - Income From Securities Transactions (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Oct. 31, 2022	Oct. 31, 2021	Oct. 31, 2022	Oct. 31, 2021
Dividend income	$ 141	$ 210	$ 254	$ 406
Interest income	158	0	201	1
Investment gains/(losses) recognized on sales of equity securities during the period	3	47	5	47
Unrealized gains/(losses) recognized on equity securities held at the end of the period	(577)	111	(434)	309
Other	7	0	0	(1)
Total investment gains/(losses)	$ (268)	$ 368	$ 26	$ 762

Amount of realized gain (loss) from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 4
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount of unrealized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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-Publisher FASB
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Amount of dividend income on nonoperating securities.

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Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.

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-Publisher FASB
-Name Accounting Standards Codification
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Amount after accretion (amortization) of discount (premium), and investment expense, of interest income and dividend income on nonoperating securities.

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This item represents investment income (expense) derived from investments in debt and equity securities unless specified in taxonomy.

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No definition available.

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