Note 3 - Other Comprehensive Income (Loss) - Components of Other Comprehensive (Loss) Income and Related Tax Effects (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022
Unrealized gains (losses) arising during the period		$ 7,916	$ (24,098)
Unrealized gains (losses) arising during the period, tax	[1]	1,346	(5,920)
Unrealized gains (losses) arising during the period, net of tax		6,570	(18,178)
Other comprehensive income (loss)		7,916	(24,098)
Other comprehensive income (loss), tax	[1]	1,346	(5,920)
Other comprehensive income (loss), net of tax		$ 6,570	$ (18,178)

[1] The tax effect on gross unrealized gains (losses) 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.