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Note 6 - Fair Value Measurements and Fair Value of Financial Instruments - Assets Measured on Recurring Basis Using Significant Unobservable Inputs (Details) - US States and Political Subdivisions Debt Securities [Member] - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2024 | Dec. 31, 2023
Balance | $ 7,122 | $ 7,349
Principal paydowns | (150) | (272)
Change in unrealized loss | (221) | 45
Balance | $ 6,751 | $ 7,122

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