Note 10 - Fair Values of Financial Instruments - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Fair Value	$ 411,326	$ 370,614
Equity securities at fair value	4,111	3,354
Total assets	426,965	385,628
Interest Rate Swap [Member]
Interest rate swaps - gross assets	11,528	11,660
Interest rate swaps - gross liabilities	11,528	11,660
Fair Value, Inputs, Level 1 [Member]
Equity securities at fair value	4,111	3,354
Total assets	4,111	3,354
Fair Value, Inputs, Level 1 [Member] \| Interest Rate Swap [Member]
Interest rate swaps - gross assets	0	0
Interest rate swaps - gross liabilities	0	0
Fair Value, Inputs, Level 2 [Member]
Equity securities at fair value	0	0
Total assets	420,245	378,670
Fair Value, Inputs, Level 2 [Member] \| Interest Rate Swap [Member]
Interest rate swaps - gross assets	11,528	11,660
Interest rate swaps - gross liabilities	11,528	11,660
Fair Value, Inputs, Level 3 [Member]
Equity securities at fair value	0	0
Total assets	2,609	3,604
Fair Value, Inputs, Level 3 [Member] \| Interest Rate Swap [Member]
Interest rate swaps - gross assets	0	0
Interest rate swaps - gross liabilities	0	0
US Government Corporations and Agencies Securities [Member]
Fair Value	35,418	18,751
US Government Corporations and Agencies Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair Value	0	0
US Government Corporations and Agencies Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Fair Value	35,418	18,751
US Government Corporations and Agencies Securities [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair Value	0	0
US States and Political Subdivisions Debt Securities [Member]
Fair Value	17,306	16,282
US States and Political Subdivisions Debt Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair Value	0	0
US States and Political Subdivisions Debt Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Fair Value	14,697	12,678
US States and Political Subdivisions Debt Securities [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair Value	2,609	3,604
Corporate Debt Securities [Member]
Fair Value	24,188	24,682
Corporate Debt Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair Value	0	0
Corporate Debt Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Fair Value	24,188	24,682
Corporate Debt Securities [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair Value	0	0
Residential Mortgage-Backed Securities [Member]
Fair Value	261,848	247,379
Residential Mortgage-Backed Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair Value	0	0
Residential Mortgage-Backed Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Fair Value	261,848	247,379
Residential Mortgage-Backed Securities [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair Value	0	0
Commercial Mortgage-Backed Securities [Member]
Fair Value	72,566	63,520
Commercial Mortgage-Backed Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair Value	0	0
Commercial Mortgage-Backed Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Fair Value	72,566	63,520
Commercial Mortgage-Backed Securities [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair Value	$ 0	$ 0