Note 7 - Fair Value Measurement (Details) - Fair Value of Financial Instruments - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Financial assets
Cash and due from banks	$ 27,890	$ 28,745
Cash and due from banks, fair value	27,901	28,762
Federal funds sold	1,082	1,329
Federal funds sold, fair value	1,082	1,329
Securities available-for-sale	54,757	52,544
Restricted equity securities	2,765	2,535
Restricted equity securities, fair value	2,765	2,535
Loans held for sale	289	1,643
Loans held for sale, fair value	289	1,643
Loans, net	377,716	364,060
Loans, net, fair value	380,568	362,440
Bank owned life insurance	6,328	6,285
Bank owned life insurance, fair value	6,328	6,285
Accrued income	2,010	2,057
Accrued income, fair value	2,010	2,057
Financial liabilities
Total deposits	413,618	399,546
Total deposits, fair value	414,104	400,117
FHLB borrowings	22,000	22,000
FHLB borrowings, fair value	22,165	22,191
Subordinated notes	7,202	7,194
Subordinated notes, fair value	7,055	7,354
Other borrowings	1,072	2,361
Other borrowings, fair value	1,072	2,361
Accrued interest payable	569	372
Accrued interest payable, fair value	569	372
Fair Value, Inputs, Level 1 [Member]
Financial assets
Cash and due from banks, fair value	26,140	26,995
Federal funds sold	1,082	1,329
Federal funds sold, fair value	1,082	1,329
Fair Value, Inputs, Level 2 [Member]
Financial assets
Cash and due from banks, fair value	1,761	1,767
Securities available-for-sale	54,757	52,544
Restricted equity securities	2,765	2,535
Restricted equity securities, fair value	2,765	2,535
Loans held for sale	289	1,643
Loans held for sale, fair value	289	1,643
Bank owned life insurance	6,328	6,285
Bank owned life insurance, fair value	6,328	6,285
Accrued income	2,010	2,057
Accrued income, fair value	2,010	2,057
Financial liabilities
Total deposits, fair value	414,104	400,117
FHLB borrowings, fair value	22,165	22,191
Subordinated notes, fair value	7,055	7,354
Other borrowings	1,072	2,361
Other borrowings, fair value	1,072	2,361
Accrued interest payable, fair value	569	372
Fair Value, Inputs, Level 3 [Member]
Financial assets
Loans, net, fair value	$ 380,568	$ 362,440