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Note 1 - Basis of Presentation and Accounting Policies - Held to Maturity Securities (Details) - US Treasury Securities [Member] $ in Thousands | Jun. 30, 2024 USD ($)
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Held to maturity U.S. Treasury securities, amortized cost | $ 58,822
Held to maturity U.S. Treasury securities, gross unrealized gains | 384
Held to maturity U.S. Treasury securities, fair value | $ 59,206

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