Note 3 - Loans - Segregated by Class of Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015
Commercial and Agricultural Portfolio Segment [Member] | Commercial [Member]
Loans	$ 45,773	$ 47,782	$ 48,759
Commercial and Agricultural Portfolio Segment [Member] | Agricultural [Member]
Loans	26,547	19,193	27,373
Real Estate Portfolio Segment [Member] | Commercial [Member]
Loans	349,392	346,262	347,703
Real Estate Portfolio Segment [Member] | Commercial Construction [Member]
Loans	33,724	40,107	43,589
Real Estate Portfolio Segment [Member] | Residential Construction [Member]
Loans	10,325	9,413	10,465
Real Estate Portfolio Segment [Member] | Residential [Member]
Loans	195,045	197,002	195,800
Real Estate Portfolio Segment [Member] | Farmland [Member]
Loans	73,801	61,780	61,551
Consumer and Other Portfolio Segment [Member] | Consumer [Member]
Loans	20,378	20,605	20,958
Consumer and Other Portfolio Segment [Member] | Other [Member]
Loans	21,132	16,492	8,006
Loans	$ 776,117	$ 758,636	$ 764,204