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Note 4 - Investments - Investments Classified by Contractual Maturity Date (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Jun. 30, 2022
--- | --- | ---
Amortized cost | [1] | $ 7,729 |  | $ 8,576
Amortized Cost, held to maturity debt securities, due after One year through Five years |  | 1,000 |  |
Investments in debt securities | [1] | 7,008 | [2] | $ 10,625
Fair Value, held to maturity debt securities, due after One year through Five years |  | $ 768 |  |
[1] | Changes in unrealized gains and losses are included in the statement of comprehensive income (loss), except for embedded derivatives. Changes in unrealized and realized gains and losses for embedded derivatives are included in earnings in the statement of operations.
[2] | Principal payments of $750,000 are due quarterly with a final maturity in January 2026.

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