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Note 8 - Fair Value Measurement - Schedule of Fair Value Measurement of Financial Instruments (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Jun. 30, 2022
--- | --- | ---
Debt Securities, Available-for-sale | $ 30,953 | $ 26,173
Corporate & Government Debt Mutual Funds Securities [Member] |  |
Debt Securities, Available-for-sale | 18,926 | 19,191
Corporate & Government Debt ETFs Securities [Member] |  |
Debt Securities, Available-for-sale | 6,912 | 6,982
Interest-bearing Time Deposits [Member] |  |
Debt Securities, Available-for-sale | 5,115 | 0
Reported Value Measurement [Member] |  |
Debt Securities, Available-for-sale | 30,953 | 26,173
Reported Value Measurement [Member] | Corporate & Government Debt Mutual Funds Securities [Member] | Short-Term Investments [Member] |  |
Debt Securities, Available-for-sale | 18,926 | 19,191
Reported Value Measurement [Member] | Corporate & Government Debt ETFs Securities [Member] | Short-Term Investments [Member] |  |
Debt Securities, Available-for-sale | 6,912 | 6,982
Reported Value Measurement [Member] | Interest-bearing Time Deposits [Member] | Short-Term Investments [Member] |  |
Debt Securities, Available-for-sale | 5,115 | 0
Estimate of Fair Value Measurement [Member] |  |
Debt Securities, Available-for-sale | 30,953 | 26,173
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Debt Securities, Available-for-sale | 25,838 | 26,173
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Debt Securities, Available-for-sale | 5,115 | 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 | 18,926 | 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 | 18,926 | 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 | 6,912 | 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 | 6,912 | 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 | 5,115 | 0
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 | 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 | 5,115 | 0
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 | $ 0 | $ 0

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