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Note 8 - Loans & Allowance for Loan Losses (Details Textual)
3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
contract
Sep. 30, 2015
contract
Sep. 30, 2016
USD ($)
contract
loan
Sep. 30, 2015
USD ($)
contract
Dec. 31, 2015
USD ($)
Accounts Notes And Loans Receivable [Line Items]          
Bank Overdrafts $ 172,000   $ 172,000   $ 203,000
Financing Receivable, Modifications, Recorded Investment $ 3,428,000   $ 3,428,000   2,278,000
Number of TDRs | contract 1 1 11 1  
Loans and Leases Receivable, Impaired, Commitment to Lend $ 2,020,000   $ 2,020,000   1,919,000
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down     $ 0 $ 5,000  
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | contract 0 0 0 0  
Consumer Mortgage Loan on Real Estate Number of Loan in Foreclosure | loan     0    
Performing Financial Instruments [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Financing Receivable, Modifications, Recorded Investment $ 1,149,000   $ 1,149,000   1,288,000
Nonperforming Financial Instruments [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Financing Receivable, Modifications, Recorded Investment $ 2,279,000   $ 2,279,000   $ 990,000
Residential Portfolio Segment [Member] | Maximum [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Loan to Value Ratio     80.00%