Note 6 - Fair Value of Financial Instruments - Financial Instruments Recorded at Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Debt Securities, Available-for-Sale	$ 615,350	$ 624,779
Fair Value, Recurring [Member]
Debt Securities, Available-for-Sale	615,350	624,779
Derivative - interest rate swaps		1,274
Assets, Fair Value Disclosure	616,223	626,053
Derivative - interest rate swaps		395
Fair Value, Recurring [Member] \| Interest Rate Swap [Member]
Derivative - interest rate swaps	873
Derivative - interest rate swaps	574
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Debt Securities, Available-for-Sale	0	0
Derivative - interest rate swaps		0
Assets, Fair Value Disclosure	0	0
Derivative - interest rate swaps		0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Interest Rate Swap [Member]
Derivative - interest rate swaps	0
Derivative - interest rate swaps	0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Debt Securities, Available-for-Sale	615,234	624,643
Derivative - interest rate swaps		1,274
Assets, Fair Value Disclosure	616,107	625,917
Derivative - interest rate swaps		395
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Interest Rate Swap [Member]
Derivative - interest rate swaps	873
Derivative - interest rate swaps	574
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Debt Securities, Available-for-Sale	116	136
Derivative - interest rate swaps		0
Assets, Fair Value Disclosure	116	136
Derivative - interest rate swaps		0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Interest Rate Swap [Member]
Derivative - interest rate swaps	0
Derivative - interest rate swaps	0
US States and Political Subdivisions Debt Securities [Member]
Debt Securities, Available-for-Sale	133,559	135,543
US States and Political Subdivisions Debt Securities [Member] \| Fair Value, Recurring [Member]
Debt Securities, Available-for-Sale	133,559	135,543
US States and Political Subdivisions Debt Securities [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Debt Securities, Available-for-Sale	0	0
US States and Political Subdivisions Debt Securities [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Debt Securities, Available-for-Sale	133,443	135,407
US States and Political Subdivisions Debt Securities [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Debt Securities, Available-for-Sale	116	136
Passthrough Mortgage Securities [Member]
Debt Securities, Available-for-Sale	131,195	129,440
Passthrough Mortgage Securities [Member] \| Fair Value, Recurring [Member]
Debt Securities, Available-for-Sale	131,195	129,440
Passthrough Mortgage Securities [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Debt Securities, Available-for-Sale	0	0
Passthrough Mortgage Securities [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Debt Securities, Available-for-Sale	131,195	129,440
Passthrough Mortgage Securities [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Debt Securities, Available-for-Sale	0	0
Collateralized Debt Obligations [Member]
Debt Securities, Available-for-Sale	141,287	145,059
Collateralized Debt Obligations [Member] \| Fair Value, Recurring [Member]
Debt Securities, Available-for-Sale	141,287	145,059
Collateralized Debt Obligations [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Debt Securities, Available-for-Sale	0	0
Collateralized Debt Obligations [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Debt Securities, Available-for-Sale	141,287	145,059
Collateralized Debt Obligations [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Debt Securities, Available-for-Sale	0	0
US Government Agencies Debt Securities [Member] \| Fair Value, Recurring [Member]
Debt Securities, Available-for-Sale	94,444	101,427
US Government Agencies Debt Securities [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Debt Securities, Available-for-Sale	0	0
US Government Agencies Debt Securities [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Debt Securities, Available-for-Sale	94,444	101,427
US Government Agencies Debt Securities [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Debt Securities, Available-for-Sale	0	0
Corporate Bond Securities [Member]
Debt Securities, Available-for-Sale	114,865	113,310
Corporate Bond Securities [Member] \| Fair Value, Recurring [Member]
Debt Securities, Available-for-Sale	114,865	113,310
Corporate Bond Securities [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Debt Securities, Available-for-Sale	0	0
Corporate Bond Securities [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Debt Securities, Available-for-Sale	114,865	113,310
Corporate Bond Securities [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Debt Securities, Available-for-Sale	$ 0	$ 0