Note 16 - Fair Value Measurements (Details) - Estimated Fair Values and Related Carrying Amounts of Financial Instruments - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Financial assets:
Cash and due from banks	$ 12,152	$ 12,894	$ 13,283	$ 14,783
Interest-bearing deposits	130,811	102,548
Securities	388,159	384,296
Restricted securities	1,129	1,089
Mortgage loans held for sale	634	291
Loans, net	610,711	597,203
Accrued interest receivable	5,769	5,748
Bank-owned life insurance	22,401	21,797
Financial liabilities:
Deposits	1,018,859	982,428
Accrued interest payable	56	68
Fair Value, Inputs, Level 1 [Member]
Financial assets:
Cash and due from banks	12,152	12,894
Interest-bearing deposits	130,811	102,548
Fair Value, Inputs, Level 2 [Member]
Financial assets:
Securities	394,163	390,547
Restricted securities	1,129	1,089
Mortgage loans held for sale	634	291
Accrued interest receivable	5,769	5,748
Bank-owned life insurance	22,401	21,797
Financial liabilities:
Deposits	826,476	765,682
Accrued interest payable	56	68
Fair Value, Inputs, Level 3 [Member]
Financial assets:
Loans, net	621,590	633,063
Financial liabilities:
Deposits	$ 193,912	$ 216,469