Note 3 - Securities - Securities in a Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Less than 12 months, fair value	$ 71,311	$ 97,762
Less than 12 months, unrealized loss	(14,947)	(1,885)
12 months or more, fair value	60,026	3,026
12 months or more, unrealized loss	(19,586)	(33)
Total, fair value	131,337	100,788
Total, unrealized loss	(34,533)	(1,918)
US Government Agencies Debt Securities [Member]
Less than 12 months, fair value	3,981	4,568
Less than 12 months, unrealized loss	(926)	(35)
12 months or more, fair value	826	0
12 months or more, unrealized loss	(371)	0
Total, fair value	4,807	4,568
Total, unrealized loss	(1,297)	(35)
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member]
Less than 12 months, fair value	1,309	7,254
Less than 12 months, unrealized loss	(70)	(130)
12 months or more, fair value	4,660	0
12 months or more, unrealized loss	(755)	0
Total, fair value	5,969	7,254
Total, unrealized loss	(825)	(130)
Collateralized Mortgage Obligations [Member]
Less than 12 months, fair value	13,020	39,964
Less than 12 months, unrealized loss	(1,959)	(801)
12 months or more, fair value	22,465	1,584
12 months or more, unrealized loss	(5,430)	(3)
Total, fair value	35,485	41,548
Total, unrealized loss	(7,389)	(804)
US States and Political Subdivisions Debt Securities [Member]
Less than 12 months, fair value	38,219	39,872
Less than 12 months, unrealized loss	(10,863)	(814)
12 months or more, fair value	27,586	1,442
12 months or more, unrealized loss	(12,569)	(30)
Total, fair value	65,805	41,314
Total, unrealized loss	(23,432)	(844)
Corporate Debt Securities [Member]
Less than 12 months, fair value	14,782	6,104
Less than 12 months, unrealized loss	(1,129)	(105)
12 months or more, fair value	4,489	0
12 months or more, unrealized loss	(461)	0
Total, fair value	19,271	6,104
Total, unrealized loss	$ (1,590)	$ (105)