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Note 3 - Investments - Investments Classified by Contractual Maturity Date (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Jun. 30, 2023
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Investments in available-for-sale debt securities, amortized cost | $ 7,414 | [1] | $ 7,729
Amortized Cost | 1,000 |  |
Investments in debt securities | 6,343 | [1] | $ 7,008
Fair Value, held to maturity debt securities, due after five years through ten years | $ 795 |  |
[1] | Principal payments of $750,000 are due quarterly with a final maturity date in January 2026.

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