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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