Note 8 - Fair Value Measurements (Details) - Estimated Fair Values and Related Carrying Amounts of Financial Instruments - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014	Dec. 31, 2013
Financial Assets:
Cash and due from banks	$ 12,446	$ 12,894	$ 12,815	$ 13,283
Interest-bearing deposits	90,295	102,548
Securities	365,876	384,296
Restricted securities	1,129	1,089
Mortgage loans held for sale	1,331	291
Loans, net	617,638	597,203
Accrued interest receivable	5,659	5,748
Bank-owned life insurance	22,248	21,797
Financial Liabilities:
Deposits	962,530	982,428
Accrued interest payable	61	68
Fair Value, Inputs, Level 1 [Member]
Financial Assets:
Cash and due from banks	12,446	12,894
Interest-bearing deposits	90,295	102,548
Fair Value, Inputs, Level 2 [Member]
Financial Assets:
Securities	370,675	390,547
Restricted securities	1,129	1,089
Mortgage loans held for sale	1,331	291
Accrued interest receivable	5,659	5,748
Bank-owned life insurance	22,248	21,797
Financial Liabilities:
Deposits	765,359	765,682
Accrued interest payable	61	68
Fair Value, Inputs, Level 3 [Member]
Financial Assets:
Loans, net	628,160	633,063
Financial Liabilities:
Deposits	$ 196,097	$ 216,469