Note 7 - Loans and Allowance for Loan Losses - Allowance for Loan Losses and the Recorded Investment In Loans by Impairment Method (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015
Collectively evaluated for impairment	$ 6,342		$ 6,396
Total ending allowance balance	9,222	$ 9,507	9,344	$ 9,485	$ 9,828	$ 10,315
Loans individually evaluated for impairment	39,196		41,895
Loans collectively evaluated for impairment	949,853		929,080
Loans, net of unearned income	989,049		970,975
Individually evaluated for impairment	2,880		2,948
Real Estate Portfolio Segment [Member]
Collectively evaluated for impairment	5,555		5,639
Total ending allowance balance	7,961	8,184	8,205	8,404	8,709	9,173
Loans individually evaluated for impairment	38,436		41,311
Loans collectively evaluated for impairment	844,606		829,581
Loans, net of unearned income	883,042		870,892
Individually evaluated for impairment	2,406		2,566
Commercial Portfolio Segment [Member]
Collectively evaluated for impairment	662		618
Total ending allowance balance	900	864	854	806	839	820
Loans individually evaluated for impairment	431		438
Loans collectively evaluated for impairment	97,350		90,410
Loans, net of unearned income	97,781		90,848
Individually evaluated for impairment	238		236
Consumer Portfolio Segment [Member]
Collectively evaluated for impairment	125		139
Total ending allowance balance	361	$ 459	285	$ 275	$ 280	$ 322
Loans individually evaluated for impairment	329		146
Loans collectively evaluated for impairment	7,897		9,089
Loans, net of unearned income	8,226		9,235
Individually evaluated for impairment	$ 236		$ 146