Note 2 - Investments - Schedule of Carrying Value and Fair Value of Equity Securities (Details) - USD ($)	Jan. 31, 2023	Apr. 30, 2022
Equity securities, cost	$ 13,217,000	$ 13,318,000
Equity securities, fair value	17,986,000	17,647,000
Exchange Traded Funds [Member]
Equity securities, cost	13,217,000	13,318,000
Equity securities, gross unrealized gains	4,815,000	4,348,000
Equity securities, gross unrealized losses	(46,000)	(19,000)
Equity securities, fair value	$ 17,986,000	$ 17,647,000

Cost of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). Excludes equity method investment and investment in equity security without readily determinable fair value.

No definition available.

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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

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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.

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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.

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