Note 3 - Loans (Details) - Loans Segregated by Class of Loans - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014
Commercial and Agricultural
Loans receivable	$ 760,078	$ 746,094	$ 735,763
Commercial and Agricultural Portfolio Segment [Member] | Commercial [Member]
Commercial and Agricultural
Loans receivable	52,506	50,960	41,840
Commercial and Agricultural Portfolio Segment [Member] | Agricultural [Member]
Commercial and Agricultural
Loans receivable	24,019	16,689	18,568
Real Estate Portfolio Segment [Member] | Commercial [Member]
Commercial and Agricultural
Loans receivable	341,167	332,231	332,895
Real Estate Portfolio Segment [Member] | Commercial Constuction [Member]
Commercial and Agricultural
Loans receivable	46,699	51,259	50,180
Real Estate Portfolio Segment [Member] | Residential Construction [Member]
Commercial and Agricultural
Loans receivable	11,327	11,221	10,875
Real Estate Portfolio Segment [Member] | Residential [Member]
Commercial and Agricultural
Loans receivable	202,805	203,753	201,513
Real Estate Portfolio Segment [Member] | Farmland [Member]
Commercial and Agricultural
Loans receivable	54,135	49,951	49,175
Consumer and Other Portfolio Segment [Member] | Consumer [Member]
Commercial and Agricultural
Loans receivable	21,371	22,820	23,548
Consumer and Other Portfolio Segment [Member] | Other [Member]
Commercial and Agricultural
Loans receivable	$ 6,049	$ 7,210	$ 7,169