Note 5 - Loans - Performing and Nonperforming Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Performing Financial Instruments [Member] | Commercial Portfolio Segment [Member]
Gross loans	$ 134,525	$ 130,811
Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Gross loans	48,365	28,319
Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]
Gross loans	280,781	237,886
Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Gross loans	159,674	155,228
Performing Financial Instruments [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Gross loans	43,066	45,457
Performing Financial Instruments [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Gross loans	8,972	9,615
Performing Financial Instruments [Member] | Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Gross loans	41,421	45,473
Performing Financial Instruments [Member] | Consumer Portfolio Segment [Member]
Gross loans	52,125	49,753
Performing Financial Instruments [Member]
Gross loans	768,929	702,542
Nonperforming Financial Instruments [Member] | Commercial Portfolio Segment [Member]
Gross loans	1,710	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	800	1,071
Nonperforming Financial Instruments [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Gross loans	3,392	3,649
Nonperforming Financial Instruments [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Gross loans	1,798	1,775
Nonperforming Financial Instruments [Member] | Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Gross loans	942
Nonperforming Financial Instruments [Member] | Consumer Portfolio Segment [Member]
Gross loans	252	120
Nonperforming Financial Instruments [Member]
Gross loans	10,090	14,097
Commercial Portfolio Segment [Member]
Gross loans	136,235	132,805
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Gross loans	48,365	28,319
Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]
Gross loans	281,977	243,374
Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Gross loans	160,474	156,299
Commercial Real Estate Portfolio Segment [Member]
Gross loans	490,816	427,992
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Gross loans	46,458	49,106
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Gross loans	10,770	11,390
Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Gross loans	42,363	45,473
Residential Portfolio Segment [Member]
Gross loans	99,591	105,969
Consumer Portfolio Segment [Member]
Gross loans	52,377	49,873
Gross loans	$ 779,019	$ 716,639