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Note 3 - Loans and Allowance for Loan Losses (Details Textual)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
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 $ 649,000   $ 649,000   $ 754,000
Impaired Financing Receivable, Interest Income, Cash Basis Method 0   $ 0    
Loans Charge-off Period     90 days    
Collateral Dependent Loans, Value of Significant Properties 196,000   $ 196,000    
Mortgage Loans in Process of Foreclosure, Amount $ 943,000   $ 943,000   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 0 0 0 0  
Classified Loans [Member]          
Allowance for Loan and Lease Losses, Period Increase (Decrease)     $ 563,000   559,000
Purchased Credit Impaired Loans [Member]          
Allowance for Credit Losses, Change in Method of Calculating Impairment $ 0   0   0
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Provision for Loan Losses 0 $ 0 0 $ 6,000  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses, Decreases $ 0 $ 0 0 $ 0  
Qualitative Factor Past Due Loans [Member]          
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method     $ 2,200,000   $ 1,800,000
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)     $ 526,000   $ 501,000
Bank Overdrafts [Member]          
Loans Charge-off Period     45 days