Note 6 - Loans (Details) - Performing and Nonperforming Loans - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]
Gross loans	$ 718,533	$ 660,898
Performing Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	702,940	639,226
Nonperforming Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	15,593	21,672
Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	144,749	150,253
Commercial Portfolio Segment [Member] | Performing Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	142,243	145,141
Commercial Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	2,506	5,112
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	419,060	364,306
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	29,701	30,099
Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	237,597	213,883
Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	151,762	120,324
Commercial Real Estate Portfolio Segment [Member] | Performing Financial Instruments [Member] | Construction Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	29,701	30,099
Commercial Real Estate Portfolio Segment [Member] | Performing Financial Instruments [Member] | Commercial Non-owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans		205,565
Commercial Real Estate Portfolio Segment [Member] | Performing Financial Instruments [Member] | Commercial Owner Occupied Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans		118,946
Commercial Real Estate Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] | Commercial Non-owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans		8,318
Commercial Real Estate Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] | Commercial Owner Occupied Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans		1,378
Commercial Real Estate Portfolio Segment [Member] | Individual Tax Identification Number Loan [Member] | Real Estate Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans		52,830
Commercial Real Estate Portfolio Segment [Member] | Individual Tax Identification Number Loan [Member] | Performing Financial Instruments [Member] | Real Estate Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans		48,183
Commercial Real Estate Portfolio Segment [Member] | Individual Tax Identification Number Loan [Member] | Nonperforming Financial Instruments [Member] | Real Estate Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans		4,647
Residential Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	108,080	110,967
Residential Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	237,597
Residential Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	151,762
Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	45,733	44,981
Residential Portfolio Segment [Member] | Performing Financial Instruments [Member] | Commercial Non-owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	232,443
Residential Portfolio Segment [Member] | Performing Financial Instruments [Member] | Commercial Owner Occupied Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	149,834
Residential Portfolio Segment [Member] | Performing Financial Instruments [Member] | Home Equity Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	45,710	44,957
Residential Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] | Commercial Non-owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	5,154
Residential Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] | Commercial Owner Occupied Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	1,928
Residential Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] | Home Equity Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	23	24
Residential Portfolio Segment [Member] | Individual Tax Identification Number Loan [Member] | Real Estate Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	50,162	52,830
Residential Portfolio Segment [Member] | Individual Tax Identification Number Loan [Member] | Performing Financial Instruments [Member] | Real Estate Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	45,934
Residential Portfolio Segment [Member] | Individual Tax Identification Number Loan [Member] | Nonperforming Financial Instruments [Member] | Real Estate Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	4,228
Residential Portfolio Segment [Member] | Mortgage Receivable [Member] | Real Estate Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	12,185	13,156
Residential Portfolio Segment [Member] | Mortgage Receivable [Member] | Performing Financial Instruments [Member] | Real Estate Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	10,516	11,021
Residential Portfolio Segment [Member] | Mortgage Receivable [Member] | Nonperforming Financial Instruments [Member] | Real Estate Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	1,669	2,135
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	46,644	35,372
Consumer Portfolio Segment [Member] | Performing Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	46,559	35,314
Consumer Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	$ 85	$ 58