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Note 6 - Fair Value Measurement - Schedule of Fair Value Measurement of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Jun. 30, 2021
Debt Securities, Available-for-sale	$ 26,173	$ 27,351
Corporate & Government Debt Mutual Funds Securities [Member]
Debt Securities, Available-for-sale	19,191	19,985
Corporate & Government Debt ETFs Securities [Member]
Debt Securities, Available-for-sale	6,982	7,366
Reported Value Measurement [Member]
Debt Securities, Available-for-sale	26,173	27,351
Reported Value Measurement [Member] | Corporate & Government Debt Mutual Funds Securities [Member]
Debt Securities, Available-for-sale	19,191	19,985
Reported Value Measurement [Member] | Corporate & Government Debt ETFs Securities [Member]
Debt Securities, Available-for-sale	6,982	7,366
Estimate of Fair Value Measurement [Member]
Debt Securities, Available-for-sale	26,173	27,351
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]
Debt Securities, Available-for-sale	26,173	27,351
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
Debt Securities, Available-for-sale	0	0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]
Debt Securities, Available-for-sale	0	0
Estimate of Fair Value Measurement [Member] | Corporate & Government Debt Mutual Funds Securities [Member]
Debt Securities, Available-for-sale	19,191	19,985
Estimate of Fair Value Measurement [Member] | Corporate & Government Debt Mutual Funds Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Debt Securities, Available-for-sale	19,191	19,985
Estimate of Fair Value Measurement [Member] | Corporate & Government Debt Mutual Funds Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Debt Securities, Available-for-sale	0	0
Estimate of Fair Value Measurement [Member] | Corporate & Government Debt Mutual Funds Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Debt Securities, Available-for-sale	0	0
Estimate of Fair Value Measurement [Member] | Corporate & Government Debt ETFs Securities [Member]
Debt Securities, Available-for-sale	6,982	7,366
Estimate of Fair Value Measurement [Member] | Corporate & Government Debt ETFs Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Debt Securities, Available-for-sale	6,982	7,366
Estimate of Fair Value Measurement [Member] | Corporate & Government Debt ETFs Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Debt Securities, Available-for-sale	0	0
Estimate of Fair Value Measurement [Member] | Corporate & Government Debt ETFs Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Debt Securities, Available-for-sale	$ 0	$ 0

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 https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=124260329&loc=d3e26610-111562

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (aa)
-URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563

+ Details

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