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Note 2 - Investments - Schedule of Carrying Value and Fair Value of Equity Securities (Details) - USD ($)	Oct. 31, 2021	Apr. 30, 2021
Equity securities, cost	$ 21,887,000	$ 19,105,000
Equity securities, fair value	26,685,000	23,582,000
Exchange Traded Funds [Member]
Equity securities, cost	21,887,000	19,105,000
Equity securities, gross unrealized gains	4,852,000	4,532,000
Equity securities, gross unrealized losses	(54,000)	(55,000)
Equity securities, fair value	$ 26,685,000	$ 23,582,000

X

- Definition

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.

+ References

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 http://asc.fasb.org/extlink&oid=123594786&loc=SL75136599-209740

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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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