Note 6 - Components of Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Balance	$ 140,522	$ 122,687
Balance	139,390	131,043
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]
Balance	(62,556)	(81,421)
Unrealized holding gain (loss) on available for sale securities, net of tax	(3,338)	11,738
Reclassification adjustment, net of tax of ($3)		(9)
Balance	(65,894)	(69,692)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balance	(2,310)	(2,345)
Reclassification adjustment, net of tax of ($3)		0
Balance	(2,310)	(2,345)
AOCI Attributable to Parent [Member]
Balance	(64,866)	(83,766)
Unrealized holding gain (loss) on available for sale securities, net of tax	(3,338)	11,738
Reclassification adjustment, net of tax of ($3)		(9)
Balance	$ (68,204)	$ (72,037)