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Note 3 - Loans and Allowance for Loan Losses (Details Textual)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Loans Charge-off Period     90 days    
Financing Receivable, Allowance for Credit Losses, Write-downs $ 206,000 $ 120,000 $ 694,000 $ 674,000  
Collateral Dependent Loans, Value of Significant Properties 200,000   200,000    
Mortgage Loans in Process of Foreclosure, Amount $ 1.50   $ 1.50   $ 793,000
Financing Receivable, Allowance for Credit Losses, Loss Factor Increase     0.33%    
Financing Receivable, Allowance for Credit Losses, Loss Factor 20.00%   20.00%    
Loans and Leases Receivable, Impaired, Commitment to Lend $ 0   $ 0   0
Financing Receivable, Modifications, Number of Contracts 1 0 1 0  
Troubled Debt Restructuring, Principal Charge-offs $ 0 $ 0 $ 0 $ 0  
Financing Receivable, Modifications, Subsequent Default, Number of Contracts 0 0 0 0  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance $ 699,000   $ 699,000   754,000
Performance Period     180 days    
Classified Loans [Member]          
Allowance for Loan and Lease Losses, Period Increase (Decrease)     $ 590,000   559,000
Purchased Credit Impaired Loans [Member]          
Allowance for Credit Losses, Change in Method of Calculating Impairment 4,000   4,000   0
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Provision for Loan Losses $ 4,000 $ 6,000 4,000 $ 0  
Qualitative Factor Past Due Loans [Member]          
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method     2,300,000   $ 1,800,000
Allowance for Loan and Lease Losses, Period Increase (Decrease)     $ 544,000    
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)         $ 501,000
Bank Overdrafts [Member]          
Loans Charge-off Period     45 days    
Other than Consumer Portfolio Segment [Member]          
Financing Receivable, Allowance for Credit Losses, Write-downs     $ 173,000    
Number of Loans 6   6