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Note 4 - Loans and Allowance for Loan Losses (Details Textual)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Purchased Credit Impaired Loans [Member]              
Allowance for Credit Losses, Change in Method of Calculating Impairment $ 6,000       $ 6,000   $ 0
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Provision for Loan Losses 0   $ 0   6,000 $ 0  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses, Decreases   $ 0 0 $ 0   0  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance $ 951,000       951,000   1,600,000
Classified Loans [Member]              
Allowance for Loan and Lease Losses, Period Increase (Decrease)         $ 630,000   410,000
Minimum [Member]              
Performance Period         180 days    
Other than Consumer Portfolio Segment [Member]              
Number of Loans 11       11    
Financing Receivable, Allowance for Credit Losses, Write-downs         $ 471,000    
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         $ 1,300,000   $ 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)         $ 499,000   $ 457,000
Impaired Financing Receivable, Interest Income, Cash Basis Method     $ 0     $ 0  
Loans Charge-off Period         90 days    
Loans and Leases Receivable, Impaired, Commitment to Lend $ 0       $ 0   $ 0
Financing Receivable, Modifications, Number of Contracts 0   0   0 0  
Financing Receivable, Allowance for Credit Losses, Write-downs $ 331,000   $ 125,000   $ 555,000 $ 1,382,000  
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  
Collateral Dependent Loans, Value of Significant Properties $ 200,000       $ 200,000    
Mortgage Loans in Process of Foreclosure, Amount $ 742,000       $ 742,000    
Financing Receivable, Allowance for Credit Losses, Loss Factor Increase         0.25%    
Financing Receivable, Allowance for Credit Losses, Loss Factor 20.00%       20.00%