Note 3 - Investment Securities - Gross Unrealized Losses on Continuous Basis for Investment Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Less than 12 months Fair Value	$ 9,207	$ 22,303
Less than 12 months Unrealized losses	89	552
12 months or more Fair value	96,204	100,035
12 months or more Unrealized losses	18,048	22,790
Total Fair value	105,411	122,338
Total Unrealized losses	18,137	23,342
US States and Political Subdivisions Debt Securities [Member]
Less than 12 months Fair Value	0	0
Less than 12 months Unrealized losses	0	0
12 months or more Fair value	452	487
12 months or more Unrealized losses	3	13
Total Fair value	452	487
Total Unrealized losses	3	13
SBA Pools [Member]
Less than 12 months Fair Value	148	162
Less than 12 months Unrealized losses	0	0
12 months or more Fair value	326	372
12 months or more Unrealized losses	4	6
Total Fair value	474	534
Total Unrealized losses	4	6
Corporate Debt Securities [Member]
Less than 12 months Fair Value	0	0
Less than 12 months Unrealized losses	0	0
12 months or more Fair value	6,327	7,185
12 months or more Unrealized losses	719	869
Total Fair value	6,327	7,185
Total Unrealized losses	719	869
Collateralized Mortgage-Backed Securities [Member]
Less than 12 months Fair Value	9,059	22,141
Less than 12 months Unrealized losses	89	552
12 months or more Fair value	89,099	91,991
12 months or more Unrealized losses	17,322	21,902
Total Fair value	98,158	114,132
Total Unrealized losses	$ 17,411	$ 22,454