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Note 5 - Loans (Details Textual)
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2017
Sep. 30, 2018
USD ($)
Sep. 30, 2017
Fair Value of Collateral Dependent Loans as a Percentage of Appraised or Estimated Value of Collateral     85.00%  
Allowance for Loan and Lease Losses, Period Increase (Decrease), Total     $ (200,000)  
Loans and Leases Receivable, Impaired, Commitment to Lend $ 0   $ 0  
Financing Receivable, Modifications, Subsequent Default, Number of Contracts     0  
TDR Loans Transferred to Non-performing, Number of Contracts 0 0 0 0
Extension of Credit [Member]        
Commitments and Contingencies $ 45,000,000   $ 45,000,000  
Extension of Lines of Credit [Member]        
Commitments and Contingencies $ 304,100,000   $ 304,100,000  
Originated Before January 1, 2010 [Member]        
Percent of Loan Portfolio to Total Loans 11.00%   11.00%  
Residential Portfolio Segment [Member]        
Allowance for Loan and Lease Losses, Loss Emergence Period     1 year 120 days  
Commercial Portfolio Segment [Member]        
Allowance for Loan and Lease Losses, Loss Emergence Period     1 year 211 days  
Commercial Real Estate Portfolio Segment [Member]        
Number of Real Estate Classified as Troubled Debt Restructuring Sold     1  
Financing Receivable, Modification, Sold During Period     $ 1,800,000  
Loss on Sale of Real Estate Classified as Troubled Debt Restructuring     $ 300,000  
Taxi Medallion Portfolio Segment [Member]        
Number of Assets Foreclosed on During the Period     1  
Taxi Medallion Portfolio Segment [Member] | Other Assets [Member]        
Other Repossessed Assets $ 35,000   $ 35,000