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Note 6 - Fair Value Measurement - Schedule of Fair Value Measurement of Financial Instruments (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Jun. 30, 2022
--- | --- | ---
Debt Securities, Available-for-sale | $ 27,919 | $ 26,173
Corporate & Government Debt Mutual Funds Securities [Member] |  |
Debt Securities, Available-for-sale | 18,965 | 19,191
Corporate & Government Debt ETFs Securities [Member] |  |
Debt Securities, Available-for-sale | 6,958 | 6,982
Interest-bearing Time Deposits [Member] |  |
Debt Securities, Available-for-sale | 1,996 |
Reported Value Measurement [Member] |  |
Debt Securities, Available-for-sale | 27,919 | 26,173
Reported Value Measurement [Member] | Corporate & Government Debt Mutual Funds Securities [Member] | Short-Term Investments [Member] |  |
Debt Securities, Available-for-sale | 18,965 | 19,191
Reported Value Measurement [Member] | Corporate & Government Debt ETFs Securities [Member] | Short-Term Investments [Member] |  |
Debt Securities, Available-for-sale | 6,958 | 6,982
Reported Value Measurement [Member] | Interest-bearing Time Deposits [Member] | Short-Term Investments [Member] |  |
Debt Securities, Available-for-sale | 1,996 |
Estimate of Fair Value Measurement [Member] |  |
Debt Securities, Available-for-sale | 27,919 | 26,173
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Debt Securities, Available-for-sale | 25,923 | 26,173
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Debt Securities, Available-for-sale | 1,996 | 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] | Short-Term Investments [Member] |  |
Debt Securities, Available-for-sale | 18,965 | 19,191
Estimate of Fair Value Measurement [Member] | Corporate & Government Debt Mutual Funds Securities [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Debt Securities, Available-for-sale | 18,965 | 19,191
Estimate of Fair Value Measurement [Member] | Corporate & Government Debt Mutual Funds Securities [Member] | Short-Term Investments [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] | Short-Term Investments [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] | Short-Term Investments [Member] |  |
Debt Securities, Available-for-sale | 6,958 | 6,982
Estimate of Fair Value Measurement [Member] | Corporate & Government Debt ETFs Securities [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Debt Securities, Available-for-sale | 6,958 | 6,982
Estimate of Fair Value Measurement [Member] | Corporate & Government Debt ETFs Securities [Member] | Short-Term Investments [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] | Short-Term Investments [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Debt Securities, Available-for-sale | 0 | $ 0
Estimate of Fair Value Measurement [Member] | Interest-bearing Time Deposits [Member] | Short-Term Investments [Member] |  |
Debt Securities, Available-for-sale | 1,996 |
Estimate of Fair Value Measurement [Member] | Interest-bearing Time Deposits [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Debt Securities, Available-for-sale | 0 |
Estimate of Fair Value Measurement [Member] | Interest-bearing Time Deposits [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Debt Securities, Available-for-sale | 1,996 |
Estimate of Fair Value Measurement [Member] | Interest-bearing Time Deposits [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Debt Securities, Available-for-sale |  |

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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 -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (aa) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481830/320-10-45-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479130/326-30-45-1 + Details
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