Note 15 - Accumulated Other Comprehensive Income (Loss) - Changes in AOCI (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Balance	$ 347,633	$ 327,433	$ 337,894	$ 320,258
Balance	350,387	331,981	350,387	331,981
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]
Balance	4,430	8,418	7,920	2,902
Net unrealized gains (losses) on securities available for sale, net of tax	(1,717)	(192)	(5,207)	5,962
Net unrealized gains (losses) on cash flow hedges, net of tax	0	0	0	0
Reclassification adjustment for realized gains on securities, net of tax				(638)
Net unrealized gains (losses) on cash flow hedges, net of tax	0	0	0	0
Balance	2,713	8,226	2,713	8,226
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Balance	(2,761)	(4,403)	(3,846)	(2,084)
Net unrealized gains (losses) on securities available for sale, net of tax	0	0	0	0
Net unrealized gains (losses) on cash flow hedges, net of tax	181	190	1,266	(2,129)
Reclassification adjustment for realized gains on securities, net of tax				0
Net unrealized gains (losses) on cash flow hedges, net of tax	181	190	1,266	(2,129)
Balance	(2,580)	(4,213)	(2,580)	(4,213)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balance	(1,637)	(1,301)	(1,637)	(1,301)
Net unrealized gains (losses) on securities available for sale, net of tax	0	0	0	0
Net unrealized gains (losses) on cash flow hedges, net of tax	0	0	0	0
Reclassification adjustment for realized gains on securities, net of tax				0
Net unrealized gains (losses) on cash flow hedges, net of tax	0	0	0	0
Balance	(1,637)	(1,301)	(1,637)	(1,301)
AOCI Attributable to Parent [Member]
Balance	32	2,714	2,437	(483)
Net unrealized gains (losses) on securities available for sale, net of tax	(1,717)	(192)	(5,207)	5,962
Net unrealized gains (losses) on cash flow hedges, net of tax	181	190	1,266	(2,129)
Reclassification adjustment for realized gains on securities, net of tax				(638)
Net unrealized gains (losses) on cash flow hedges, net of tax	181	190	1,266	(2,129)
Balance	$ (1,504)	$ 2,712	$ (1,504)	$ 2,712