Note 8 - Loans - Average Balance and Interest Income Recognized Related to Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Average Recorded Investment	$ 67,775	$ 92,031	$ 74,239	$ 88,137
Interest Income Recognized	197	588	540	1,653
Commercial Portfolio Segment [Member]
Average Recorded Investment	16,379	30,346	22,989	30,723
Interest Income Recognized	0	148	0	242
Real Estate Construction Portfolio Segment [Member]
Average Recorded Investment	4,548	4,368	4,310	4,444
Interest Income Recognized	50	98	220	245
Commercial Real Estate Portfolio Segment [Member]
Average Recorded Investment	37,017	40,708	37,964	37,730
Interest Income Recognized	140	268	297	966
Residential Mortgage and Equity Lines Portfolio Segment [Member]
Average Recorded Investment	9,831	16,609	8,976	15,240
Interest Income Recognized	$ 7	$ 74	$ 23	$ 200