Note 6 - Accumulated Other Comprehensive Income (Loss) - Changes in Accumulated Other Comprehensive Income (Loss) by Component, Net of Tax (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Balance		$ 137,644	$ 144,670	$ 145,335	$ 143,810
Other comprehensive income (loss)		(10,917)	976	(21,053)	(391)
Balance		128,220	146,044	128,220	146,044
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]
Balance	[1]	(6,674)	2,917	3,462	4,284
Other comprehensive income (loss)		(10,917)		(21,053)	(391)
Balance	[1]	$ (17,591)	$ 3,893	$ (17,591)	$ 3,893

[1] All amounts are net of tax. Amounts in parentheses indicate debits to AOCI.