Note 3 - Accumulated Other Comprehensive Income - Components of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Balance	$ 211,729	$ 166,670	$ 106,835
Other comprehensive loss, net of tax	(71,331)	(8,773)	5,350
Balance	162,950	211,729	166,670
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]
Balance	179	8,952	3,602
Other comprehensive loss before reclassifications, net of tax	(53,800)	(8,737)	5,441
Amounts reclassified from accumulated other comprehensive income, net of tax	(3)	(36)	(91)
Other comprehensive loss, net of tax	(53,803)	(8,773)	5,350
Balance	(53,624)	179	8,952
AOCI, Gain (Loss), Debt Securities, Securities Transferred To Held-to-maturity [Member]
Balance	0	0	0
Other comprehensive loss before reclassifications, net of tax	(17,528)	0	0
Amounts reclassified from accumulated other comprehensive income, net of tax	0	0	0
Other comprehensive loss, net of tax	(17,528)	0	0
Balance	(17,528)	0	0
AOCI Attributable to Parent [Member]
Balance	179	8,952	3,602
Other comprehensive loss before reclassifications, net of tax	(71,328)	(8,737)	5,441
Amounts reclassified from accumulated other comprehensive income, net of tax	(3)	(36)	(91)
Other comprehensive loss, net of tax	(71,331)	(8,773)	5,350
Balance	$ (71,152)	$ 179	$ 8,952