Note 8 - Fair Value Measurements - Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Available-for-sale securities	$ 334,404	$ 344,040
Fair Value, Recurring [Member]
Available-for-sale securities	334,404	344,040
Total assets	334,614	344,211
Total liabilities	857	2,332
Fair Value, Recurring [Member] \| Interest Rate Swap [Member]
Interest rate swaps	210	171
Interest rate swaps	857	2,332
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Available-for-sale securities	0	0
Total assets	0	0
Total liabilities	0	0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Interest Rate Swap [Member]
Interest rate swaps	0	0
Interest rate swaps	0	0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Available-for-sale securities	334,404	344,040
Total assets	334,614	344,211
Total liabilities	857	2,332
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Interest Rate Swap [Member]
Interest rate swaps	210	171
Interest rate swaps	857	2,332
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Available-for-sale securities	0	0
Total assets	0	0
Total liabilities	0	0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Interest Rate Swap [Member]
Interest rate swaps	0	0
Interest rate swaps	0	0
US Government Agencies Debt Securities [Member]
Available-for-sale securities	27,431	27,545
US Government Agencies Debt Securities [Member] \| Fair Value, Recurring [Member]
Available-for-sale securities	27,431	27,545
US Government Agencies Debt Securities [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Available-for-sale securities	0	0
US Government Agencies Debt Securities [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Available-for-sale securities	27,431	27,545
US Government Agencies Debt Securities [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Available-for-sale securities	0	0
US States and Political Subdivisions Debt Securities [Member]
Available-for-sale securities	121,072	122,797
US States and Political Subdivisions Debt Securities [Member] \| Fair Value, Recurring [Member]
Available-for-sale securities	121,072	122,797
US States and Political Subdivisions Debt Securities [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Available-for-sale securities	0	0
US States and Political Subdivisions Debt Securities [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Available-for-sale securities	121,072	122,797
US States and Political Subdivisions Debt Securities [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Available-for-sale securities	0	0
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member]
Available-for-sale securities	185,901	193,698
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] \| Fair Value, Recurring [Member]
Available-for-sale securities	185,901	193,698
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Available-for-sale securities	0	0
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Available-for-sale securities	185,901	193,698
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Available-for-sale securities	$ 0	$ 0

Fair value portion of asset recognized for present right to economic benefit.

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