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, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Average Recorded Investment	$ 118,905	$ 133,809	$ 117,006	$ 129,741
Interest Income Recognized	1,116	1,224	1,927	2,275
Commercial Portfolio Segment [Member]
Average Recorded Investment	46,792	46,763	42,388	45,978
Interest Income Recognized	587	498	820	825
Real Estate Construction Portfolio Segment [Member]
Average Recorded Investment	4,726	8,378	4,771	8,258
Interest Income Recognized	0	0	0	0
Commercial Real Estate Portfolio Segment [Member]
Average Recorded Investment	54,404	64,004	56,724	61,316
Interest Income Recognized	448	633	942	1,264
Residential Mortgage and Equity Lines Portfolio Segment [Member]
Average Recorded Investment	12,983	14,664	13,123	14,189
Interest Income Recognized	$ 81	$ 93	$ 165	$ 186