Note 5 - Loans - Performing and Nonperforming Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Gross loans	$ 810,194	$ 804,211
Commercial Portfolio Segment [Member]
Gross loans	145,635	153,844
Commercial Real Estate Portfolio Segment [Member]
Gross loans	516,196	496,742
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Gross loans	46,228	57,771
Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]
Gross loans	305,802	287,455
Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Gross loans	164,166	151,516
Residential Portfolio Segment [Member]
Gross loans	96,940	101,944
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Gross loans	44,211	45,566
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Gross loans	19,710	20,425
Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Gross loans	33,019	35,953
Consumer Portfolio Segment [Member]
Gross loans	51,423	51,681
Performing Financial Instruments [Member]
Gross loans	800,197	792,825
Performing Financial Instruments [Member] | Commercial Portfolio Segment [Member]
Gross loans	143,101	151,095
Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Gross loans	46,228	57,771
Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]
Gross loans	304,606	286,259
Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Gross loans	163,512	150,732
Performing Financial Instruments [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Gross loans	40,880	41,990
Performing Financial Instruments [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Gross loans	18,373	18,511
Performing Financial Instruments [Member] | Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Gross loans	32,113	35,036
Performing Financial Instruments [Member] | Consumer Portfolio Segment [Member]
Gross loans	51,384	51,431
Nonperforming Financial Instruments [Member]
Gross loans	9,997	11,386
Nonperforming Financial Instruments [Member] | Commercial Portfolio Segment [Member]
Gross loans	2,534	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	654	784
Nonperforming Financial Instruments [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Gross loans	3,331	3,576
Nonperforming Financial Instruments [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Gross loans	1,337	1,914
Nonperforming Financial Instruments [Member] | Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Gross loans	906	917
Nonperforming Financial Instruments [Member] | Consumer Portfolio Segment [Member]
Gross loans	$ 39	$ 250