Note 5 - Loans (Details) - Performing and Nonperforming Loans - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]
Gross loans	$ 724,243	$ 716,639
Performing Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	712,545	702,542
Nonperforming Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	11,698	14,097
Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	136,721	132,805
Commercial Portfolio Segment [Member] | Performing Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	134,158	130,811
Commercial Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	2,563	1,994
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	429,878	427,992
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	27,554	28,319
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Performing Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	27,554	28,319
Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	247,840	243,374
Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member] | Performing Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	246,643	237,886
Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member] | Nonperforming Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	1,197	5,488
Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	154,484	156,299
Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member] | Performing Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	153,294	155,228
Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member] | Nonperforming Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	1,190	1,071
Residential Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	103,658	105,969
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	48,384	49,106
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member] | Performing Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	44,679	45,457
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member] | Nonperforming Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	3,705	3,649
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	10,947	11,390
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member] | Performing Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	9,205	9,615
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member] | Nonperforming Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	1,742	1,775
Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	44,327	45,473
Residential Portfolio Segment [Member] | Home Equity Loan [Member] | Performing Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	43,057	45,473
Residential Portfolio Segment [Member] | Home Equity Loan [Member] | Nonperforming Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	1,270
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	53,986	49,873
Consumer Portfolio Segment [Member] | Performing Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	53,955	49,753
Consumer Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	$ 31	$ 120