Note 3 - Loans Segregated by Class of Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015
Commercial and Agricultural Portfolio Segment [Member] | Commercial [Member]
Loans and Leases Receivable, Gross	$ 45,115	$ 47,782	$ 51,774
Commercial and Agricultural Portfolio Segment [Member] | Agricultural [Member]
Loans and Leases Receivable, Gross	18,562	19,193	19,188
Real Estate Portfolio Segment [Member] | Commercial [Member]
Loans and Leases Receivable, Gross	347,372	346,262	341,845
Real Estate Portfolio Segment [Member] | Commercial Construction [Member]
Loans and Leases Receivable, Gross	35,970	40,107	48,611
Real Estate Portfolio Segment [Member] | Residential Construction [Member]
Loans and Leases Receivable, Gross	9,849	9,413	10,030
Real Estate Portfolio Segment [Member] | Residential [Member]
Loans and Leases Receivable, Gross	195,679	197,002	202,878
Real Estate Portfolio Segment [Member] | Farmland [Member]
Loans and Leases Receivable, Gross	66,285	61,780	51,572
Consumer and Other Portfolio Segment [Member] | Consumer [Member]
Loans and Leases Receivable, Gross	19,661	20,605	21,705
Consumer and Other Portfolio Segment [Member] | Other [Member]
Loans and Leases Receivable, Gross	15,768	16,492	6,031
Loans and Leases Receivable, Gross	$ 754,261	$ 758,636	$ 753,634