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Note 5 - Loans (Details Textual)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2016
Jun. 30, 2017
USD ($)
Jun. 30, 2016
Fair Value of Collateral Dependent Loans as a Percentage of Appraised or Estimated Value of Collateral     85.00%  
Collateral Dependent Impaired Loans Measured by Third Party Appraisals     $ 41,900  
Collateral Dependent Impaired Loans Measured by Third Party Appraisals Percentage     82.40%  
Collateral Dependent Impaired Loans Measured Internally     $ 8,900  
Collateral Dependent Impaired Loans Measured Internally Percentage     17.60%  
Loans and Leases Receivable, Impaired, Commitment to Lend $ 0   $ 0  
TDR Loans Transferred to Non-performing, Number of Contracts 0 0 0 0
Extension of Credit [Member]        
Commitments and Contingencies $ 77,100   $ 77,100  
Extension of Lines of Credit [Member]        
Commitments and Contingencies $ 243,000   $ 243,000