Note 16 - Components of Accumulated Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Balance	$ 200,607	$ 183,726
Net pension gain (loss) arising during the period, net of tax	(3,244)	1,478
Less amortization of prior service cost included in net periodic pension cost, net of tax	(9)	(87)
Balance	191,751	200,607
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]
Balance	13,167	76
Unrealized holding gain (loss) on available for sale securities, net of tax	(10,308)	13,176
Reclassification adjustment, net of tax	(5)	(85)
Net pension gain (loss) arising during the period, net of tax
Balance	2,854	13,167
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balance	(10,147)	(8,582)
Net pension gain (loss) arising during the period, net of tax	3,244	(1,478)
Less amortization of prior service cost included in net periodic pension cost, net of tax	(9)	(87)
Balance	(6,912)	(10,147)
AOCI Attributable to Parent [Member]
Balance	3,020	(8,506)
Unrealized holding gain (loss) on available for sale securities, net of tax	(10,308)	13,176
Reclassification adjustment, net of tax	(5)	(85)
Net pension gain (loss) arising during the period, net of tax	3,244	(1,478)
Less amortization of prior service cost included in net periodic pension cost, net of tax	(9)	(87)
Balance	$ (4,058)	$ 3,020