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, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Average Recorded Investment	$ 92,102	$ 118,905	$ 86,167	$ 117,006
Interest Income Recognized	573	1,116	1,215	1,927
Commercial Portfolio Segment [Member]
Average Recorded Investment	33,695	46,792	30,913	42,388
Interest Income Recognized	71	587	95	820
Real Estate Construction Portfolio Segment [Member]
Average Recorded Investment	4,458	4,726	4,482	4,771
Interest Income Recognized	49	0	147	0
Commercial Real Estate Portfolio Segment [Member]
Average Recorded Investment	36,225	54,404	36,225	56,724
Interest Income Recognized	375	448	824	942
Residential Mortgage and Equity Lines Portfolio Segment [Member]
Average Recorded Investment	17,724	12,983	14,547	13,123
Interest Income Recognized	$ 78	$ 81	$ 149	$ 165