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Note 8 - Loans by Loan Class Modified as TDRs (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
contract
Sep. 30, 2015
USD ($)
contract
Sep. 30, 2016
USD ($)
contract
Sep. 30, 2015
USD ($)
contract
Financing Receivable Modifications [Line Items]        
Number of contracts | contract 1 1 11 1
Pre-modification outstanding recorded investment $ 96 $ 142 $ 1,694 $ 142
Post-modification outstanding recorded investment $ 95 $ 142 $ 1,631 $ 142
Retail Portfolio Segment [Member] | Family Residential Mortgages [Member]        
Financing Receivable Modifications [Line Items]        
Number of contracts | contract   1   1
Pre-modification outstanding recorded investment   $ 142   $ 142
Post-modification outstanding recorded investment   $ 142   $ 142
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]        
Financing Receivable Modifications [Line Items]        
Number of contracts | contract     6  
Pre-modification outstanding recorded investment     $ 1,074  
Post-modification outstanding recorded investment     $ 1,033  
Commercial Portfolio Segment [Member] | Secured by Residential Real Estate [Member]        
Financing Receivable Modifications [Line Items]        
Number of contracts | contract     4  
Pre-modification outstanding recorded investment     $ 524  
Post-modification outstanding recorded investment     $ 503  
Consumer [Member] | Retail Portfolio Segment [Member]        
Financing Receivable Modifications [Line Items]        
Number of contracts | contract 1   1  
Pre-modification outstanding recorded investment $ 96   $ 96  
Post-modification outstanding recorded investment $ 95   $ 95