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	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
Individually evaluated for impairment	$ 3,153	$ 2,948
Collectively evaluated for impairment	6,354	6,396
Total ending allowance balance	9,507	9,344	$ 9,828	$ 10,315
Loans individually evaluated for impairment	39,732	41,895
Loans collectively evaluated for impairment	950,101	929,080
Loans, net of unearned income	989,833	970,975
Real Estate Portfolio Segment [Member]
Individually evaluated for impairment	2,567	2,566
Collectively evaluated for impairment	5,617	5,639
Total ending allowance balance	8,184	8,205	8,709	9,173
Loans individually evaluated for impairment	38,897	41,311
Loans collectively evaluated for impairment	848,028	829,581
Loans, net of unearned income	886,925	870,892
Commercial Portfolio Segment [Member]
Individually evaluated for impairment	252	236
Collectively evaluated for impairment	612	618
Total ending allowance balance	864	854	839	820
Loans individually evaluated for impairment	498	438
Loans collectively evaluated for impairment	93,930	90,410
Loans, net of unearned income	94,428	90,848
Consumer Portfolio Segment [Member]
Individually evaluated for impairment	334	146
Collectively evaluated for impairment	125	139
Total ending allowance balance	459	285	$ 280	$ 322
Loans individually evaluated for impairment	337	146
Loans collectively evaluated for impairment	8,143	9,089
Loans, net of unearned income	$ 8,480	$ 9,235