Note 15 - Accumulated Other Comprehensive Income (Loss) - Changes in AOCI (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022		Mar. 31, 2021
Balance	$ 354,792	[1]	$ 337,894
Balance	335,074		341,793
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]
Balance	(1,701)		7,920
Net unrealized gains (losses) on securities available for sale, net of tax	(24,199)		(4,611)
Net unrealized gains on cash flow hedges, net of tax	0		0
Balance	(25,900)		3,309
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Balance	(2,212)		(3,846)
Net unrealized gains (losses) on securities available for sale, net of tax	0		0
Net unrealized gains on cash flow hedges, net of tax	1,489		1,407
Balance	(723)		(2,439)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balance	(1,162)		(1,637)
Net unrealized gains (losses) on securities available for sale, net of tax	0		0
Net unrealized gains on cash flow hedges, net of tax	0		0
Balance	(1,162)		(1,637)
AOCI Attributable to Parent [Member]
Balance	(5,075)		2,437
Net unrealized gains (losses) on securities available for sale, net of tax	(24,199)		(4,611)
Net unrealized gains on cash flow hedges, net of tax	1,489		1,407
Balance	$ (27,785)		$ (767)

[1] Derived from audited consolidated financial statements