Note 3 - Loans Segregated by Class of Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015
Commercial and Agricultural Portfolio Segment [Member] | Commercial [Member]
Loans and Leases Receivable, Gross	$ 47,934	$ 47,782	$ 52,506
Commercial and Agricultural Portfolio Segment [Member] | Agricultural [Member]
Loans and Leases Receivable, Gross	24,307	19,193	24,019
Real Estate Portfolio Segment [Member] | Commercial [Member]
Loans and Leases Receivable, Gross	345,181	346,262	341,167
Real Estate Portfolio Segment [Member] | Commercial Construction [Member]
Loans and Leases Receivable, Gross	32,292	40,107	46,699
Real Estate Portfolio Segment [Member] | Residential Construction [Member]
Loans and Leases Receivable, Gross	9,141	9,413	11,327
Real Estate Portfolio Segment [Member] | Residential [Member]
Loans and Leases Receivable, Gross	196,140	197,002	202,805
Real Estate Portfolio Segment [Member] | Farmland [Member]
Loans and Leases Receivable, Gross	70,137	61,780	54,135
Consumer and Other Portfolio Segment [Member] | Consumer [Member]
Loans and Leases Receivable, Gross	19,936	20,605	21,371
Consumer and Other Portfolio Segment [Member] | Other [Member]
Loans and Leases Receivable, Gross	19,141	16,492	6,049
Loans and Leases Receivable, Gross	$ 764,209	$ 758,636	$ 760,078