Note 3 - Securities - Securities in a Continuous Loss Position (Details) Pure in Thousands, $ in Thousands	Jun. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)
Number of Securities	203	199
Less than 12 months, fair value	$ 78,864	$ 52,079
Less than 12 months, unrealized loss	(949)	(465)
12 months or more, fair value	348,024	336,756
12 months or more, unrealized loss	(33,547)	(29,679)
U.S. agencies	426,888	388,835
U.S. agencies	$ (34,496)	$ (30,144)
US Government Agencies Debt Securities [Member]
Number of Securities	54	51
Less than 12 months, fair value	$ 23,474	$ 190
Less than 12 months, unrealized loss	(430)	(3)
12 months or more, fair value	77,087	79,556
12 months or more, unrealized loss	(5,228)	(4,427)
U.S. agencies	100,561	79,746
U.S. agencies	$ (5,658)	$ (4,430)
Collateralized Mortgage Obligations [Member]
Number of Securities	7	6
Less than 12 months, fair value	$ 3,994	$ 4,791
Less than 12 months, unrealized loss	(17)	(1)
12 months or more, fair value	8,125	3,873
12 months or more, unrealized loss	(539)	(443)
U.S. agencies	12,119	8,664
U.S. agencies	$ (556)	$ (444)
US States and Political Subdivisions Debt Securities [Member]
Number of Securities	112	106
Less than 12 months, fair value	$ 45,807	$ 44,859
Less than 12 months, unrealized loss	(491)	(453)
12 months or more, fair value	202,642	178,812
12 months or more, unrealized loss	(23,595)	(19,412)
U.S. agencies	248,449	223,671
U.S. agencies	$ (24,086)	$ (19,865)
SBA Pool [Member]
Number of Securities	3	4
Less than 12 months, fair value	$ 83	$ 116
Less than 12 months, unrealized loss	0	0
12 months or more, fair value	220	472
12 months or more, unrealized loss	(2)	(2)
U.S. agencies	303	588
U.S. agencies	$ (2)	$ (2)
Corporate Debt Securities [Member]
Number of Securities	11	13
Less than 12 months, fair value	$ 0	$ 0
Less than 12 months, unrealized loss	0	0
12 months or more, fair value	38,055	41,508
12 months or more, unrealized loss	(3,445)	(3,992)
U.S. agencies	38,055	41,508
U.S. agencies	$ (3,445)	$ (3,992)
Asset-Backed Securities [Member]
Number of Securities	16	19
Less than 12 months, fair value	$ 5,506	$ 2,123
Less than 12 months, unrealized loss	(11)	(8)
12 months or more, fair value	21,895	32,535
12 months or more, unrealized loss	(738)	(1,403)
U.S. agencies	27,401	34,658
U.S. agencies	$ (749)	$ (1,411)