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Note 2 - Investments - Investments Classified by Contractual Maturity Date (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Jun. 30, 2022
--- | --- | ---
Amortized cost | $ 8,246 | [1] | $ 8,576
Amortized Cost | 1,000 |  |
Investments in debt securities | 8,127 | [1] | $ 10,625
Fair Value, held to maturity debt securities, due after five years through ten years | $ 749 |  |
[1] | Principal payments of $750,000 are due quarterly with a final maturity date in January 2026.

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