Note 8 - Loans - Average Balance and Interest Income Recognized Related to Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Average Recorded Investment	$ 74,044	$ 92,102	$ 77,523	$ 86,167
Interest Income Recognized	212	573	386	1,215
Commercial Portfolio Segment [Member]
Average Recorded Investment	24,450	33,695	26,348	30,913
Interest Income Recognized	31	71	43	95
Real Estate Construction Portfolio Segment [Member]
Average Recorded Investment	4,149	4,458	4,189	4,482
Interest Income Recognized	73	49	170	147
Commercial Real Estate Portfolio Segment [Member]
Average Recorded Investment	36,792	36,225	38,445	36,225
Interest Income Recognized	100	375	157	824
Residential Mortgage and Equity Lines Portfolio Segment [Member]
Average Recorded Investment	8,653	17,724	8,541	14,547
Interest Income Recognized	$ 8	$ 78	$ 16	$ 149