Note 3 - Loans (Details) - Loans Segregated by Class of Loans - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014
Commercial and Agricultural
Loans receivable	$ 764,204	$ 746,094	$ 743,281
Commercial and Agricultural Portfolio Segment [Member] | Commercial [Member]
Commercial and Agricultural
Loans receivable	48,759	50,960	46,481
Commercial and Agricultural Portfolio Segment [Member] | Agricultural [Member]
Commercial and Agricultural
Loans receivable	27,373	16,689	23,017
Real Estate Portfolio Segment [Member] | Commercial [Member]
Commercial and Agricultural
Loans receivable	347,703	332,231	327,498
Real Estate Portfolio Segment [Member] | Commercial Constuction [Member]
Commercial and Agricultural
Loans receivable	43,589	51,259	50,455
Real Estate Portfolio Segment [Member] | Residential Construction [Member]
Commercial and Agricultural
Loans receivable	10,465	11,221	9,700
Real Estate Portfolio Segment [Member] | Residential [Member]
Commercial and Agricultural
Loans receivable	195,800	203,753	204,313
Real Estate Portfolio Segment [Member] | Farmland [Member]
Commercial and Agricultural
Loans receivable	61,551	49,951	50,401
Consumer and Other Portfolio Segment [Member] | Consumer [Member]
Commercial and Agricultural
Loans receivable	20,958	22,820	23,448
Consumer and Other Portfolio Segment [Member] | Other [Member]
Commercial and Agricultural
Loans receivable	$ 8,006	$ 7,210	$ 7,968