Note 7 - Loans - Average Balance and Interest Income Recognized Related to Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Average Recorded Investment	$ 137,595	$ 132,946	$ 127,958	$ 135,176
Interest Income Recognized	994	1,020	1,976	2,168
Commercial Portfolio Segment [Member]
Average Recorded Investment	19,376	14,940	21,345	13,805
Interest Income Recognized	86	167	171	370
Real Estate Construction Portfolio Segment [Member]
Average Recorded Investment	42,752	9,923	29,912	15,107
Interest Income Recognized	356		696
Commercial Real Estate Portfolio Segment [Member]
Average Recorded Investment	60,295	90,971	60,847	89,212
Interest Income Recognized	445	713	898	1,513
Residential Mortgage and Equity Lines Portfolio Segment [Member]
Average Recorded Investment	15,172	17,112	15,854	17,052
Interest Income Recognized	$ 107	$ 140	$ 211	$ 285