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Note 8 - Loans & Allowance for Loan Losses (Details Textual)
6 Months Ended 12 Months Ended
Jun. 30, 2018
USD ($)
contract
loan
Jun. 30, 2017
USD ($)
contract
Dec. 31, 2017
USD ($)
Accounts Notes And Loans Receivable [Line Items]      
Bank Overdrafts $ 122,000   $ 126,000
Financing Receivable, Modifications, Recorded Investment $ 3,677,000   4,315,000
Number of newly identified TDR during the current period | contract 1    
Loans and Leases Receivable, Impaired, Commitment to Lend $ 0   0
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down $ 0 $ 3,000  
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | contract 0 1  
Loan outstanding balance   $ 21,000  
Performing Financial Instruments [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Financing Receivable, Modifications, Recorded Investment $ 1,233,000   1,321,000
Nonperforming Financial Instruments [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Financing Receivable, Modifications, Recorded Investment $ 2,444,000   $ 2,994,000
Residential Portfolio Segment [Member] | Consumer Loans [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Consumer Mortgage Loan on Real Estate Number of Loan in Foreclosure | loan 4    
Consumer Mortgage Loans in Process of Foreclosure, Amount $ 559,000    
Residential Portfolio Segment [Member] | Maximum [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Loan to Value Ratio 80.00%    
Residential Buildings and Dwellings [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Concentration of loans to lessors percentage of total loans 15.60%   15.70%
Nonresidential Buildings [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Concentration of loans to lessors percentage of total loans 18.60%   17.30%