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Note 7 - Loans and Related Allowance for Loan and Lease Losses (Details) - Major Classifications of Net Loans (USD $)
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable Gross $ 450,119,000   $ 435,725,000      
Less allowance for loan and lease losses 7,129,000 7,015,000 7,046,000 7,749,000 7,731,000 7,779,000
Net loans 442,990,000   428,679,000      
Commercial and Industrial [Member]
            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable Gross 55,577,000   54,498,000      
Less allowance for loan and lease losses 596,000 867,000 614,000 875,000 1,229,000 1,732,000
Real Estate Construction [Member]
            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable Gross 26,615,000   25,601,000      
Less allowance for loan and lease losses 423,000 488,000 576,000 1,192,000 1,047,000 1,123,000
Residential Real Estate Mortgage [Member]
            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable Gross 219,229,000   210,310,000      
Less allowance for loan and lease losses 4,130,000 3,726,000 3,664,000 3,626,000 3,207,000 2,872,000
Commercial Real Estate Mortgage [Member]
            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable Gross 142,505,000   141,171,000      
Less allowance for loan and lease losses 1,925,000 1,862,000 2,170,000 2,005,000 2,201,000 1,991,000
Consumer Installment [Member]
            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable Gross 6,193,000   4,145,000      
Less allowance for loan and lease losses $ 55,000 $ 72,000 $ 22,000 $ 51,000 $ 47,000 $ 61,000