Note 3 - Investment Securities - Continuous Unrealized Loss Positions (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Less than 12 months, fair value	$ 95,386	$ 3,694
Less than 12 months, unrealized losses	(2,114)	(31)
12 months or more, fair value	3,560	0
12 months or more, unrealized losses	(159)	0
Fair value	98,946	3,694
Unrealized losses	(2,273)	(31)
US Government Agencies Debt Securities [Member]
Less than 12 months, fair value	15,091	0
Less than 12 months, unrealized losses	(191)	0
12 months or more, fair value	0	0
12 months or more, unrealized losses	0	0
Fair value	15,091	0
Unrealized losses	(191)	0
Collateralized Mortgage Backed Securities [Member]
Less than 12 months, fair value	51,990	0
Less than 12 months, unrealized losses	(1,334)	0
12 months or more, fair value	0	0
12 months or more, unrealized losses	0	0
Fair value	51,990	0
Unrealized losses	(1,334)	0
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	0	0
12 months or more, unrealized losses	0	0
Fair value	0	0
Unrealized losses	0	0
US States and Political Subdivisions Debt Securities [Member]
Less than 12 months, fair value	28,305	3,694
Less than 12 months, unrealized losses	(589)	(31)
12 months or more, fair value	3,560	0
12 months or more, unrealized losses	(159)	0
Fair value	31,865	3,694
Unrealized losses	$ (748)	$ (31)