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Note 4 - Loans (Details)
3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Note 4 - Loans (Details) [Line Items]              
Mortgage Loans in Process of Foreclosure, Amount             $ 0
Financing Receivable, Modifications, Number of Contracts         2 0  
Provision for Loan and Lease Losses $ 1,049,000   $ 1,221,000   $ 2,402,000 $ 2,144,000  
Allowance for Credit Losses, Change in Method of Calculating Impairment 392,000       $ 392,000   60,000
Loans and Leases Receivable, Impaired, Commitment to Lend   $ 0   $ 0     0
Financing Receivable, Modifications, Subsequent Default, Number of Contracts         0    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 446,000       $ 446,000   60,000
Number of Days Past Due to Be Considered in Default       90 days      
Minimum Prior Year Principal Balance of Commercial Real Estate Loans Required to Be Reviewed Annually   60.00%   60.00%      
Bank Overdrafts $ 206,000       $ 206,000   479,000
Troubled Debt Restructuring [Member]              
Note 4 - Loans (Details) [Line Items]              
Debt Instrument, Interest Rate, Stated Percentage 5.25%       5.25%    
Troubled Debt Restructuring [Member] | Interest Rate Below Market Reduction [Member]              
Note 4 - Loans (Details) [Line Items]              
Debt Instrument, Interest Rate, Stated Percentage 4.00%       4.00%    
Residential Portfolio Segment [Member]              
Note 4 - Loans (Details) [Line Items]              
Real Estate Acquired Through Foreclosure $ 0       $ 0   $ 0
Residential Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] | Residential Mortgage First Lien [Member]              
Note 4 - Loans (Details) [Line Items]              
Mortgage Loans in Process of Foreclosure, Amount $ 32,000       32,000    
Residential Portfolio Segment [Member] | Troubled Debt Restructuring [Member]              
Note 4 - Loans (Details) [Line Items]              
Provision for Loan and Lease Losses   $ 332,000          
Residential Mortgage First Lien [Member]              
Note 4 - Loans (Details) [Line Items]              
Financing Receivable, Modifications, Post-Modification Recorded Investment         2,700,000    
Financing Receivable, Modifications, Pre-Modification Recorded Investment         2,700,000    
Residential Mortgage Junior Lien [Member]              
Note 4 - Loans (Details) [Line Items]              
Financing Receivable, Modifications, Post-Modification Recorded Investment         245,000    
Financing Receivable, Modifications, Pre-Modification Recorded Investment         $ 245,000    
Commercial Real Estate Portfolio Segment [Member] | Owner-occupied Loan [Member]              
Note 4 - Loans (Details) [Line Items]              
Financing Receivable, Modifications, Subsequent Default, Number of Contracts           2  
Financing Receivable, Modifications, Recorded Investment     636,000     $ 636,000  
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment     $ 40,000     $ 40,000