Note 8 - Fair Value Measurement - Schedule of Fair Value Measurement of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Jun. 30, 2023
Debt Securities, Available-for-sale	$ 26,183	$ 27,919
Corporate & Government Debt Mutual Funds Securities [Member]
Debt Securities, Available-for-sale	19,147	18,965
Corporate & Government Debt ETFs Securities [Member]
Debt Securities, Available-for-sale	7,036	6,958
Interest-bearing Time Deposits [Member]
Debt Securities, Available-for-sale	0	1,996
Reported Value Measurement [Member]
Debt Securities, Available-for-sale	26,183	27,919
Reported Value Measurement [Member] | Corporate & Government Debt Mutual Funds Securities [Member] | Short-Term Investments [Member]
Debt Securities, Available-for-sale	19,147	18,965
Reported Value Measurement [Member] | Corporate & Government Debt ETFs Securities [Member] | Short-Term Investments [Member]
Debt Securities, Available-for-sale	7,036	6,958
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	26,183	27,919
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]
Debt Securities, Available-for-sale	26,183	25,923
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
Debt Securities, Available-for-sale	0	1,996
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	19,147	18,965
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	19,147	18,965
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	7,036	6,958
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	7,036	6,958
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		$ 0