Note 3 - Accumulated Other Comprehensive Income - Components of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Balance	$ 175,243	$ 163,582	$ 211,729	$ 166,670
Other comprehensive (loss) gain, net of tax	(18,423)	4,168	(61,099)	(3,621)
Balance	162,619	172,185	162,619	172,185
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]
Balance	(42,497)	1,163	179	8,952
Other comprehensive loss before reclassifications, net of tax	6	4,168	(42,670)	(3,621)
Amounts reclassified from accumulated other comprehensive income, net of tax	0	0	0	0
Other comprehensive (loss) gain, net of tax	6	4,168	(42,670)	(3,621)
Balance	(42,491)	5,331	(42,491)	5,331
AOCI, Gain (Loss), Debt Securities, Securities Transferred To Held-to-maturity [Member]
Balance	0	0	0	0
Other comprehensive loss before reclassifications, net of tax	(18,429)	0	(18,429)	0
Amounts reclassified from accumulated other comprehensive income, net of tax	0	0	0	0
Other comprehensive (loss) gain, net of tax	(18,429)	0	(18,429)	0
Balance	(18,429)	0	(18,429)	0
AOCI Attributable to Parent [Member]
Balance	(42,497)	1,163	179	8,952
Other comprehensive loss before reclassifications, net of tax	(18,423)	4,168	(61,099)	(3,621)
Amounts reclassified from accumulated other comprehensive income, net of tax	0	0	0	0
Other comprehensive (loss) gain, net of tax	(18,423)	4,168	(61,099)	(3,621)
Balance	$ (60,920)	$ 5,331	$ (60,920)	$ 5,331