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Note 3 - Investments - Investments Classified by Contractual Maturity Date (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Jun. 30, 2023
--- | --- | ---
Amortized Cost |  | $ 6,651 | [1] | $ 7,729
Amortized Cost |  | 1,000 |  |
Investments in debt securities | [1] | 5,190 |  |
Fair Value, held to maturity debt securities, due after five years through ten years |  | $ 843 |  |
[1] | Principal payments of $750,000 are due quarterly with a final maturity date in January 2026.

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