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Note 1 - Organization and Summary of Significant Accounting Policies - Schedule of Fair Value Measurements of Investments (Details) - USD ($)	Apr. 30, 2021	Apr. 30, 2020	May 01, 2018
Equity Securities, FV-NI, Total	$ 23,582,000	$ 14,125,000	$ 9,379,000
Available-for-sale fixed income securities	2,600,000	15,079,000
Investments, Fair Value Disclosure, Total	44,391,000	31,319,000
Money Market Funds [Member]
Cash equivalents	18,209,000	2,115,000
Fair Value, Inputs, Level 1 [Member]
Equity Securities, FV-NI, Total	23,582,000	14,125,000
Available-for-sale fixed income securities	2,600,000	15,079,000
Investments, Fair Value Disclosure, Total	44,391,000	31,319,000
Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member]
Cash equivalents	18,209,000	2,115,000
Fair Value, Inputs, Level 2 [Member]
Equity Securities, FV-NI, Total
Available-for-sale fixed income securities
Investments, Fair Value Disclosure, Total
Fair Value, Inputs, Level 2 [Member] | Money Market Funds [Member]
Cash equivalents
Fair Value, Inputs, Level 3 [Member]
Equity Securities, FV-NI, Total
Available-for-sale fixed income securities
Investments, Fair Value Disclosure, Total
Fair Value, Inputs, Level 3 [Member] | Money Market Funds [Member]
Cash equivalents

X

- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(6))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Section 45
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

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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
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- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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