Note 6 - Components of Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Income (Loss) (Details) (Parentheticals) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Unrealized holding gain (loss) on available for sale securities, tax			$ (2,268)
Unrealized holding gain (loss) on available for sale securities, tax			(2,268)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]
Unrealized holding gain (loss) on available for sale securities, tax	$ (4,099)	$ (7,822)		$ (23,431)
Unrealized holding gain (loss) on available for sale securities, tax	(4,099)	(7,822)		(23,431)
Reclassification adjustment for gain included in net income, taxes			700
AOCI Attributable to Parent [Member]
Unrealized holding gain (loss) on available for sale securities, tax	(4,099)	(7,822)		(23,431)
Unrealized holding gain (loss) on available for sale securities, tax	$ (4,099)	$ (7,822)		$ (23,431)
Reclassification adjustment for gain included in net income, taxes			$ 700