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Note 4 - Loans and Allowance for Loan Losses (Details) - Troubled Debt Restructuring by Accrual Status - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Dec. 31, 2013
Financing Receivable, Modifications [Line Items]      
Recorded Investment in loans $ 303,432 $ 306,485 $ 294,478
Troubled Debt Restructuring [Member]      
Financing Receivable, Modifications [Line Items]      
Accruing   1,900 1,662
Nonaccrual   2,146 1,935
Recorded Investment in loans   4,046 3,597
Related Allowance for Loan Losses   1,298 1,304
Residential Mortgage Segment [Member]      
Financing Receivable, Modifications [Line Items]      
Recorded Investment in loans   107,096 107,508
Residential Mortgage Segment [Member] | Troubled Debt Restructuring [Member]      
Financing Receivable, Modifications [Line Items]      
Accruing   492 508
Nonaccrual   166 226
Recorded Investment in loans   658 734
Related Allowance for Loan Losses   6 45
Commercial Real Estate Portfolio Segment [Member]      
Financing Receivable, Modifications [Line Items]      
Recorded Investment in loans   78,480 76,666
Commercial Real Estate Portfolio Segment [Member] | Troubled Debt Restructuring [Member]      
Financing Receivable, Modifications [Line Items]      
Accruing   1,386 1,130
Nonaccrual   338 0
Recorded Investment in loans   1,724 1,130
Related Allowance for Loan Losses   0 0
Commercial Portfolio Segment [Member]      
Financing Receivable, Modifications [Line Items]      
Recorded Investment in loans   28,406 22,003
Commercial Portfolio Segment [Member] | Troubled Debt Restructuring [Member]      
Financing Receivable, Modifications [Line Items]      
Accruing   0 0
Nonaccrual   1,642 1,709
Recorded Investment in loans   1,642 1,709
Related Allowance for Loan Losses   1,292 1,259
Home Equity And Second Mortgage [Member]      
Financing Receivable, Modifications [Line Items]      
Recorded Investment in loans   38,125 35,269
Home Equity And Second Mortgage [Member] | Troubled Debt Restructuring [Member]      
Financing Receivable, Modifications [Line Items]      
Accruing   22 24
Nonaccrual   0 0
Recorded Investment in loans   22 24
Related Allowance for Loan Losses   $ 0 $ 0