Note 7 - Other Comprehensive (Loss) Income - Components of Other Comprehensive (Loss) Income and Related Tax Effects (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Unrealized (losses) gains arising during the period	$ (12)	$ 2,845
Unrealized gains (losses) arising during the period, tax	(4)	599	[1]
Unrealized gains (losses) arising during the period, net of tax	(8)	2,246
Other comprehensive (loss) income	(12)	2,845
Other comprehensive income (loss), tax	(4)	599	[1]
Other comprehensive income (loss), net of tax	$ (8)	$ 2,246

[1] The tax effect on gross unrealized (losses) gains was impacted by a change in the effective tax rate used in 2023 to allocate the total unrealized gains on securities between the deferred tax asset and other comprehensive income.