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		9 Months Ended
		Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Balance		$ 128,220	$ 146,044	$ 145,335	$ 143,810
Other comprehensive income (loss)		(7,489)	(283)	(28,542)	(674)
Balance		122,855	146,055	122,855	146,055
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]
Balance	[1]	(17,591)	3,893	3,462	4,284
Other comprehensive income (loss)		(7,489)	(283)	(28,542)	(674)
Balance	[1]	$ (25,080)	$ 3,610	$ (25,080)	$ 3,610

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