Note 2 - Securities - Gross Unrealized Losses and Fair Value of Securities Available for Sale in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Fair value, less than 12 months	$ 103,931	$ 74,215
Unrealized loss, less than 12 months	8,564	1,749
Fair value, 12 months or longer	76,963	15,127
Unrealized loss, 12 months or longer	17,945	1,441
Total fair value	180,894	89,342
Total unrealized loss	26,509	3,190
Unrealized loss, less than 12 months	(8,564)	(1,749)
Unrealized loss, 12 months or longer	(17,945)	(1,441)
Total unrealized loss	(26,509)	(3,190)
Collateralized Mortgage-Backed Securities [Member]
Fair value, less than 12 months	8,383	4,042
Unrealized loss, less than 12 months	655	101
Fair value, 12 months or longer	4,573	1,956
Unrealized loss, 12 months or longer	1,169	86
Total fair value	12,956	5,998
Total unrealized loss	1,824	187
Unrealized loss, less than 12 months	(655)	(101)
Unrealized loss, 12 months or longer	(1,169)	(86)
Total unrealized loss	(1,824)	(187)
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member]
Fair value, less than 12 months	65,270	66,254
Unrealized loss, less than 12 months	6,400	1,589
Fair value, 12 months or longer	59,495	4,371
Unrealized loss, 12 months or longer	14,575	155
Total fair value	124,765	70,625
Total unrealized loss	20,975	1,744
Unrealized loss, less than 12 months	(6,400)	(1,589)
Unrealized loss, 12 months or longer	(14,575)	(155)
Total unrealized loss	(20,975)	(1,744)
US Government-sponsored Enterprises Debt Securities [Member]
Fair value, less than 12 months	7,012	2,448
Unrealized loss, less than 12 months	935	52
Fair value, 12 months or longer	0	0
Unrealized loss, 12 months or longer	0	(0)
Total fair value	7,012	2,448
Total unrealized loss	935	52
Unrealized loss, less than 12 months	(935)	(52)
Unrealized loss, 12 months or longer	0	0
Total unrealized loss	(935)	(52)
Mortgage-Backed Securities, Issued by Private Enterprises [Member]
Fair value, less than 12 months	2,256
Unrealized loss, less than 12 months	244
Fair value, 12 months or longer	0
Unrealized loss, 12 months or longer	0
Total fair value	2,256
Total unrealized loss	244
Unrealized loss, less than 12 months	(244)
Unrealized loss, 12 months or longer	0
Total unrealized loss	(244)
US States and Political Subdivisions Debt Securities [Member]
Fair value, less than 12 months	18,648	1,471
Unrealized loss, less than 12 months	192	7
Fair value, 12 months or longer	4,095	0
Unrealized loss, 12 months or longer	1,001	(0)
Total fair value	22,743	1,471
Total unrealized loss	1,193	7
Unrealized loss, less than 12 months	(192)	(7)
Unrealized loss, 12 months or longer	(1,001)	0
Total unrealized loss	(1,193)	(7)
Other Debt Obligations [Member]
Fair value, less than 12 months	2,362	0
Unrealized loss, less than 12 months	138	(0)
Fair value, 12 months or longer	8,800	8,800
Unrealized loss, 12 months or longer	1,200	1,200
Total fair value	11,162	8,800
Total unrealized loss	1,338	1,200
Unrealized loss, less than 12 months	(138)	0
Unrealized loss, 12 months or longer	(1,200)	(1,200)
Total unrealized loss	$ (1,338)	$ (1,200)