Note 9 - Allowance for Loan Losses and Credit Quality Information (Details) - Troubled Debt Restructurings - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	$ 7,767	$ 9,450
1-4 Family Porfolio Segment[Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	602	368
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	6,187	7,956
Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	591	571
Commercial Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	387	555
Performing Financial Instruments [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	1,718	2,036
Performing Financial Instruments [Member] | 1-4 Family Porfolio Segment[Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	241	303
Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	971	979
Performing Financial Instruments [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	121	320
Performing Financial Instruments [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	385	434
Nonperforming Financial Instruments [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	6,049	7,414
Nonperforming Financial Instruments [Member] | 1-4 Family Porfolio Segment[Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	361	65
Nonperforming Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	5,216	6,977
Nonperforming Financial Instruments [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	470	251
Nonperforming Financial Instruments [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	$ 2	$ 121