Note 2 - Investments - Income From Securities Transactions (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Jan. 31, 2023	Jan. 31, 2022	Jan. 31, 2023	Jan. 31, 2022
Dividend income	$ 190	$ 234	$ 444	$ 640
Interest income	194	(2)	395	(1)
Investment gains/(losses) recognized on sales of equity securities during the period	7	(19)	12	28
Unrealized gains/(losses) recognized on equity securities held at the end of the period	859	(215)	425	94
Other	0	(1)	0	(2)
Total investment gains/(losses)	$ 1,250	$ (3)	$ 1,276	$ 759

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
-URI https://asc.fasb.org/extlink&oid=126980263&loc=SL75117546-209714

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(3)(d))
-URI https://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263

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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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 220
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-Paragraph 1
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-URI https://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263

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Amount of dividend income on nonoperating securities.

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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
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