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, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Average Recorded Investment	$ 97,153	$ 123,851	$ 110,315	$ 127,756
Interest Income Recognized	618	1,145	1,976	3,188
Commercial Portfolio Segment [Member]
Average Recorded Investment	38,659	48,772	41,132	46,920
Interest Income Recognized	208	461	705	1,152
Real Estate Construction Portfolio Segment [Member]
Average Recorded Investment	4,662	5,980	4,734	7,490
Interest Income Recognized	0	0	0	0
Commercial Real Estate Portfolio Segment [Member]
Average Recorded Investment	40,699	55,375	51,323	59,314
Interest Income Recognized	332	576	1,034	1,757
Residential Mortgage and Equity Lines Portfolio Segment [Member]
Average Recorded Investment	13,133	13,724	13,126	14,032
Interest Income Recognized	$ 78	$ 108	$ 237	$ 279