Note 5 - Loans - Performing and Nonperforming Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Gross loans	$ 804,211	$ 716,639
Commercial Portfolio Segment [Member]
Gross loans	153,844	132,805
Commercial Real Estate Portfolio Segment [Member]
Gross loans	496,742	427,992
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Gross loans	57,771	28,319
Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]
Gross loans	287,455	243,374
Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Gross loans	151,516	156,299
Residential Portfolio Segment [Member]
Gross loans	101,944	105,969
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Gross loans	45,566	49,106
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Gross loans	12,866	13,640
Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Gross loans	43,512	43,223
Consumer Portfolio Segment [Member]
Gross loans	51,681	49,873
Performing Financial Instruments [Member]
Gross loans	792,825	702,542
Performing Financial Instruments [Member] | Commercial Portfolio Segment [Member]
Gross loans	151,095	130,811
Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Gross loans	57,771	28,319
Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]
Gross loans	286,259	237,886
Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Gross loans	150,732	155,228
Performing Financial Instruments [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Gross loans	41,990	45,457
Performing Financial Instruments [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Gross loans	10,952	11,865
Performing Financial Instruments [Member] | Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Gross loans	42,595	43,223
Performing Financial Instruments [Member] | Consumer Portfolio Segment [Member]
Gross loans	51,431	49,753
Nonperforming Financial Instruments [Member]
Gross loans	11,386	14,097
Nonperforming Financial Instruments [Member] | Commercial Portfolio Segment [Member]
Gross loans	2,749	1,994
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	5,488
Nonperforming Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Gross loans	784	1,071
Nonperforming Financial Instruments [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Gross loans	3,576	3,649
Nonperforming Financial Instruments [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Gross loans	1,914	1,775
Nonperforming Financial Instruments [Member] | Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Gross loans	917
Nonperforming Financial Instruments [Member] | Consumer Portfolio Segment [Member]
Gross loans	$ 250	$ 120