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Note 4 - Loans and Allowance for Loan Losses (Details Textual)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Purchased Credit Impaired Loans [Member]          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Provision for Loan Losses $ 0 $ 0   $ 0  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses, Decreases 6,000 0   0  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance $ 778,000   $ 778,000   $ 1,600,000
Classified Loans [Member]          
Allowance for Loan and Lease Losses, Period Increase (Decrease)     $ 642,000   410,000
Minimum [Member]          
Performance Period     180 days    
Other than Consumer Portfolio Segment [Member]          
Number of Loans 10   10    
Financing Receivable, Allowance for Credit Losses, Write-downs     $ 468,000    
Bank Overdrafts [Member]          
Loans Charge-off Period     45 days    
Qualitative Factor Past Due Loans [Member]          
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method     $ 1,700,000   $ 1,400,000
Overall Qualitative Factor [Member]          
Financing Receivable, Allowance for Credit Losses Risk Factor 1.18   1.18   1.18
Allowance for Loan and Lease Losses, Period Increase (Decrease)     $ 509,000   $ 457,000
Impaired Financing Receivable, Interest Income, Cash Basis Method   0   0  
Loans and Leases Receivable, Impaired, Commitment to Lend $ 0   $ 0   $ 0
Financing Receivable, Modifications, Number of Contracts 0   0    
Troubled Debt Restructuring, Principal Charge-offs $ 0 0 $ 0 0  
Troubled Debt Restructuring, Specific Allowance $ 0 $ 0 $ 0 $ 0  
Financing Receivable, Modifications, Subsequent Default, Number of Contracts 0 0 0 0  
Loans Charge-off Period     90 days    
Financing Receivable, Allowance for Credit Losses, Write-downs $ 120,000 $ 156,000 $ 674,000 $ 1,537,000  
Collateral Dependent Loans, Value of Significant Properties 200,000   200,000    
Mortgage Loans in Process of Foreclosure, Amount $ 799,000   $ 799,000    
Financing Receivable, Allowance for Credit Losses, Loss Factor Increase     0.25%    
Financing Receivable, Allowance for Credit Losses, Loss Factor 20.00%   20.00%