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Note 8 - Fair Value Measurement - Schedule of Fair Value Measurement of Financial Instruments (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Jun. 30, 2021
--- | --- | ---
Debt Securities, Available-for-sale | $ 26,580 | $ 27,351
Reported Value Measurement [Member] |  |
Debt Securities, Available-for-sale | 26,580 | 27,351
Estimate of Fair Value Measurement [Member] |  |
Debt Securities, Available-for-sale | 26,580 | 27,351
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Debt Securities, Available-for-sale | 26,580 | 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
Corporate & Government Debt Securities [Member] | Mutual Fund [Member] |  |
Debt Securities, Available-for-sale | 19,487 | 19,985
Corporate & Government Debt Securities [Member] | Mutual Fund [Member] | Reported Value Measurement [Member] |  |
Debt Securities, Available-for-sale | 19,487 | 19,985
Corporate & Government Debt Securities [Member] | Mutual Fund [Member] | Estimate of Fair Value Measurement [Member] |  |
Debt Securities, Available-for-sale | 19,487 | 19,985
Corporate & Government Debt Securities [Member] | Mutual Fund [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Debt Securities, Available-for-sale | 19,487 | 19,985
Corporate & Government Debt Securities [Member] | Mutual Fund [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Debt Securities, Available-for-sale | 0 | 0
Corporate & Government Debt Securities [Member] | Mutual Fund [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Debt Securities, Available-for-sale | 0 | 0
Corporate & Government Debt Securities [Member] | Exchange Traded Funds [Member] |  |
Debt Securities, Available-for-sale | 7,093 | 7,366
Corporate & Government Debt Securities [Member] | Exchange Traded Funds [Member] | Reported Value Measurement [Member] |  |
Debt Securities, Available-for-sale | 7,093 | 7,366
Corporate & Government Debt Securities [Member] | Exchange Traded Funds [Member] | Estimate of Fair Value Measurement [Member] |  |
Debt Securities, Available-for-sale | 7,093 | 7,366
Corporate & Government Debt Securities [Member] | Exchange Traded Funds [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Debt Securities, Available-for-sale | 7,093 | 7,366
Corporate & Government Debt Securities [Member] | Exchange Traded Funds [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Debt Securities, Available-for-sale | 0 | 0
Corporate & Government Debt Securities [Member] | Exchange Traded Funds [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Debt Securities, Available-for-sale | $ 0 | $ 0

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