Note 5 - Loans - Performing and Nonperforming Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Gross loans	$ 815,388	$ 804,211
Commercial Portfolio Segment [Member]
Gross loans	152,204	153,844
Commercial Real Estate Portfolio Segment [Member]
Gross loans	518,138	496,742
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Gross loans	22,275	36,792
Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]
Gross loans	310,995	292,615
Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Gross loans	184,868	167,335
Residential Portfolio Segment [Member]
Gross loans	94,266	101,944
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Gross loans	43,229	45,566
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Gross loans	18,904	20,425
Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Gross loans	32,133	35,953
Consumer Portfolio Segment [Member]
Gross loans	50,780	51,681
Performing Financial Instruments [Member]
Gross loans	806,234	792,825
Performing Financial Instruments [Member] | Commercial Portfolio Segment [Member]
Gross loans	149,794	151,095
Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Gross loans	22,275	36,792
Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]
Gross loans	309,799	291,419
Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Gross loans	184,229	166,551
Performing Financial Instruments [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Gross loans	39,883	41,990
Performing Financial Instruments [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Gross loans	18,251	18,511
Performing Financial Instruments [Member] | Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Gross loans	31,261	35,036
Performing Financial Instruments [Member] | Consumer Portfolio Segment [Member]
Gross loans	50,742	51,431
Nonperforming Financial Instruments [Member]
Gross loans	9,154	11,386
Nonperforming Financial Instruments [Member] | Commercial Portfolio Segment [Member]
Gross loans	2,410	2,749
Nonperforming Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Gross loans
Nonperforming Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]
Gross loans	1,196	1,196
Nonperforming Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Gross loans	639	784
Nonperforming Financial Instruments [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Gross loans	3,346	3,576
Nonperforming Financial Instruments [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Gross loans	653	1,914
Nonperforming Financial Instruments [Member] | Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Gross loans	872	917
Nonperforming Financial Instruments [Member] | Consumer Portfolio Segment [Member]
Gross loans	$ 38	$ 250