Note 3 - Accumulated Other Comprehensive Income - Components of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Balance	$ 189,479	$ 162,950
Other comprehensive (loss) income, net of tax	(1,447)	8,214
Balance	191,635	175,887
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]
Balance	(40,760)	(53,624)
Other comprehensive loss before reclassifications, net of tax	(1,908)	7,761
Amounts reclassified from accumulated other comprehensive income, net of tax	0	1
Other comprehensive (loss) income, net of tax	(1,908)	7,762
Balance	(42,668)	(45,862)
AOCI, Gain (Loss), Debt Securities, Securities Transferred To Held-to-maturity [Member]
Balance	(15,707)	(17,528)
Other comprehensive loss before reclassifications, net of tax	0	0
Amounts reclassified from accumulated other comprehensive income, net of tax	461	452
Other comprehensive (loss) income, net of tax	461	452
Balance	(15,246)	(17,076)
AOCI Attributable to Parent [Member]
Balance	(56,467)	(71,152)
Other comprehensive loss before reclassifications, net of tax	(1,908)	7,761
Amounts reclassified from accumulated other comprehensive income, net of tax	461	453
Other comprehensive (loss) income, net of tax	(1,447)	8,214
Balance	$ (57,914)	$ (62,938)