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Note 4 - Loans and Allowance for Loan Losses (Details)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Note 4 - Loans and Allowance for Loan Losses (Details) [Line Items]          
Loans Charge Off Period     90 days    
Financing Receivable, Allowance for Credit Losses, Write-downs $ 156,000 $ 140,000 $ 1,537,000 $ 366,000  
Collateral Dependent Loans Value Of Significant Properties 200,000   200,000    
Mortgage Loans in Process of Foreclosure, Amount $ 593,000   $ 593,000    
Financing Receivable, Allowance for Credit Losses, Loss Factor Increase     0.25%    
Financing Receivable, Allowance for Credit Losses, Loss Factor 20.00%   20.00%    
Impaired Financing Receivable, Interest Income, Cash Basis Method $ 0 $ 0 $ 0 $ 0  
Loans and Leases Receivable, Impaired, Commitment to Lend $ 0   $ 0   $ 0
Financing Receivable, Modifications, Number of Contracts 0 1 0 4  
Troubled Debt Restructurings, Principal Charge-offs   $ 0   $ 0  
Troubled Debt Restructurings, Specific Allowance   $ 0   $ 0  
Financing Receivable, Modifications, Subsequent Default, Number of Contracts 0 0 0 0  
Classified Loans [Member]          
Note 4 - Loans and Allowance for Loan Losses (Details) [Line Items]          
Allowance for Loan and Lease Losses, Period Increase (Decrease)     $ 444,000   664,000
Qualitative Factor Past Due Loans [Member]          
Note 4 - Loans and Allowance for Loan Losses (Details) [Line Items]          
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method     $ 1,400,000   $ 1,600,000
Overall Qualitative Factor [Member]          
Note 4 - Loans and Allowance for Loan Losses (Details) [Line Items]          
Financing Receivable Allowance For Credit Losses Risk Factor 1.18   1.18   1.18
Allowance for Loan and Lease Losses, Period Increase (Decrease)     $ 472,000   $ 520,000
Bank Overdrafts [Member]          
Note 4 - Loans and Allowance for Loan Losses (Details) [Line Items]          
Loans Charge Off Period     45 days    
Other Than Consumer Portfolio Segment [Member]          
Note 4 - Loans and Allowance for Loan Losses (Details) [Line Items]          
Number Of Loan 12   12    
Financing Receivable, Allowance for Credit Losses, Write-downs     $ 483,000    
Minimum [Member]          
Note 4 - Loans and Allowance for Loan Losses (Details) [Line Items]          
Performance Period     6 months