Note 6 - Loans (Details) - Performing and Nonperforming Loans - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]
Gross loans	$ 699,774	$ 660,898
Performing Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	682,813	639,226
Nonperforming Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	16,961	21,672
Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	143,088	150,253
Commercial Portfolio Segment [Member] | Performing Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	139,918	145,141
Commercial Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	3,170	5,112
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	402,214	364,306
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	27,858	30,099
Commercial Real Estate Portfolio Segment [Member] | Other Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	374,356	334,207
Commercial Real Estate Portfolio Segment [Member] | Performing Financial Instruments [Member] | Construction Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	27,858	30,099
Commercial Real Estate Portfolio Segment [Member] | Performing Financial Instruments [Member] | Other Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	366,745	324,511
Commercial Real Estate Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] | Other Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	7,611	9,696
Residential Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	109,921	110,967
Residential Portfolio Segment [Member] | Real Estate Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	63,458	65,986
Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	46,463	44,981
Residential Portfolio Segment [Member] | Performing Financial Instruments [Member] | Real Estate Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	57,390	59,204
Residential Portfolio Segment [Member] | Performing Financial Instruments [Member] | Home Equity Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	46,439	44,957
Residential Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] | Real Estate Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	6,068	6,782
Residential Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] | Home Equity Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	24	24
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	44,482	35,210
Consumer Portfolio Segment [Member] | Performing Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	44,463	35,314
Consumer Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	$ 88	$ 58