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, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Average Recorded Investment	$ 92,031	$ 97,153	$ 88,137	$ 110,315
Interest Income Recognized	588	618	1,653	1,976
Commercial Portfolio Segment [Member]
Average Recorded Investment	30,346	38,659	30,723	41,132
Interest Income Recognized	148	208	242	705
Real Estate Construction Portfolio Segment [Member]
Average Recorded Investment	4,368	4,662	4,444	4,734
Interest Income Recognized	98	0	245	0
Commercial Real Estate Portfolio Segment [Member]
Average Recorded Investment	40,708	40,699	37,730	51,323
Interest Income Recognized	268	332	966	1,034
Residential Mortgage and Equity Lines Portfolio Segment [Member]
Average Recorded Investment	16,609	13,133	15,240	13,126
Interest Income Recognized	$ 74	$ 78	$ 200	$ 237