Note 2 - Investment Securities - Continuous Unrealized Loss Positions (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Less than 12 months, fair value	$ 53,965	$ 3,694
Less than 12 months, unrealized losses	(1,143)	(31)
12 months or more, fair value	0	0
12 months or more, unrealized losses	0	0
Fair value	53,965	3,694
Unrealized losses	(1,143)	(31)
US Government Agencies Debt Securities [Member]
Less than 12 months, fair value	6,787	0
Less than 12 months, unrealized losses	(74)	0
12 months or more, fair value	0	0
12 months or more, unrealized losses	0	0
Fair value	6,787	0
Unrealized losses	(74)	0
Collateralized Mortgage Backed Securities [Member]
Less than 12 months, fair value	33,007	0
Less than 12 months, unrealized losses	(763)	0
12 months or more, fair value	0	0
12 months or more, unrealized losses	0	0
Fair value	33,007	0
Unrealized losses	(763)	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	14,171	3,694
Less than 12 months, unrealized losses	(306)	(31)
12 months or more, fair value	0	0
12 months or more, unrealized losses	0	0
Fair value	14,171	3,694
Unrealized losses	$ (306)	$ (31)