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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

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- 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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