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Note 6 - Loans (Details) - Internal Credit Quality Indicators of Gross Loans - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Financing Receivable, Recorded Investment [Line Items]      
Loans, gross $ 824,008 $ 805,059 $ 753,049
Single Family ResidentialPortfolioSegment [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans, gross 220,879 204,439 177,179
Single Family ResidentialPortfolioSegment [Member] | Accrual Loan [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans, gross 218,190 201,456  
Single Family ResidentialPortfolioSegment [Member] | Nonaccrual Loan [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans, gross 2,689 2,983  
Single Family ResidentialPortfolioSegment [Member] | Single-family Real Estate, Revolving, Open-end Loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans, gross 88,796 80,644  
Single Family ResidentialPortfolioSegment [Member] | Single-family Real Estate, Revolving, Open-end Loans [Member] | Accrual Loan [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans, gross 88,003 79,667  
Single Family ResidentialPortfolioSegment [Member] | Single-family Real Estate, Revolving, Open-end Loans [Member] | Nonaccrual Loan [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans, gross 793 977  
Single Family ResidentialPortfolioSegment [Member] | Junior Lien [Member] | Single Family Residential Closed End Loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans, gross 129,566 121,007  
Single Family ResidentialPortfolioSegment [Member] | Junior Lien [Member] | Single Family Residential Closed End Loans [Member] | Accrual Loan [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans, gross 127,797 119,079  
Single Family ResidentialPortfolioSegment [Member] | Junior Lien [Member] | Single Family Residential Closed End Loans [Member] | Nonaccrual Loan [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans, gross 1,769 1,928  
Single Family ResidentialPortfolioSegment [Member] | Senior Lien [Member] | Single Family Residential Closed End Loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans, gross 2,517 2,788  
Single Family ResidentialPortfolioSegment [Member] | Senior Lien [Member] | Single Family Residential Closed End Loans [Member] | Accrual Loan [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans, gross 2,390 2,710  
Single Family ResidentialPortfolioSegment [Member] | Senior Lien [Member] | Single Family Residential Closed End Loans [Member] | Nonaccrual Loan [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans, gross 127 78  
Consumer Portfolio Segment [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans, gross 76,359 76,984 51,849
Consumer Portfolio Segment [Member] | Accrual Loan [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans, gross 76,240 76,834  
Consumer Portfolio Segment [Member] | Nonaccrual Loan [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans, gross 119 150  
Consumer Portfolio Segment [Member] | Indirect Automobile [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans, gross 65,046 66,277  
Consumer Portfolio Segment [Member] | Indirect Automobile [Member] | Accrual Loan [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans, gross 64,974 66,161  
Consumer Portfolio Segment [Member] | Indirect Automobile [Member] | Nonaccrual Loan [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans, gross 72 116  
Consumer Portfolio Segment [Member] | Other Consumer Receivable [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans, gross 11,313 10,707  
Consumer Portfolio Segment [Member] | Other Consumer Receivable [Member] | Accrual Loan [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans, gross 11,266 10,673  
Consumer Portfolio Segment [Member] | Other Consumer Receivable [Member] | Nonaccrual Loan [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans, gross 47 34  
Unallocated Financing Receivables [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans, gross 13,127 12,684 $ 10,591
Unallocated Financing Receivables [Member] | Accrual Loan [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans, gross $ 13,127 $ 12,684