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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 | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023
Beginning | $ 7,122 | $ 7,349
Principal paydowns | (75) | (272)
Change in unrealized loss | (157) | 45
Beginning | $ 6,890 | $ 7,122

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