Note 6 - Components of Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Income (Loss) (Details) (Parentheticals) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]
Unrealized holding gain (loss) on available for sale securities, tax	$ (1,289)	$ (6,617)	$ 1,831	$ (15,609)
Reclassification adjustment for gain included in net income, taxes	702		700
AOCI Attributable to Parent [Member]
Unrealized holding gain (loss) on available for sale securities, tax	(1,289)	$ (6,617)	1,831	$ (15,609)
Reclassification adjustment for gain included in net income, taxes	$ 702		$ 700