Note 3 - Accumulated Other Comprehensive Income - Components of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Balance	$ 162,950	$ 211,729
Other comprehensive income (loss), net of tax	8,214	(42,676)
Balance	175,887	175,243
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]
Balance	(53,624)	179
Other comprehensive gain before reclassifications, net of tax	7,761	(42,676)
Amounts reclassified from accumulated other comprehensive income, net of tax	1	0
Other comprehensive income (loss), net of tax	7,762	(42,676)
Balance	(45,862)	(42,497)
AOCI, Gain (Loss), Debt Securities, Securities Transferred To Held-to-maturity [Member]
Balance	(17,528)	0
Other comprehensive gain before reclassifications, net of tax	452	0
Amounts reclassified from accumulated other comprehensive income, net of tax	0	0
Other comprehensive income (loss), net of tax	452	0
Balance	(17,076)	0
AOCI Attributable to Parent [Member]
Balance	(71,152)	179
Other comprehensive gain before reclassifications, net of tax	8,213	(42,676)
Amounts reclassified from accumulated other comprehensive income, net of tax	1	0
Other comprehensive income (loss), net of tax	8,214	(42,676)
Balance	$ (62,938)	$ (42,497)