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Note 4 - Loans and Related Allowance for Loan Losses - Troubled Debt Restructurings (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2014
USD ($)
Commercial And Industrial [Member]      
Number of contracts 6 5  
Pre-modification outstanding recorded investment $ 434 $ 610  
Post-modification outstanding recorded investment $ 434 $ 610  
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]      
Number of contracts 6 4 3
Pre-modification outstanding recorded investment $ 515 $ 166 $ 140
Post-modification outstanding recorded investment $ 535 $ 166 $ 140
Real Estate Mortgage Portfolio Segment [Member] | Commercial Loans [Member]      
Number of contracts   1  
Pre-modification outstanding recorded investment   $ 311  
Post-modification outstanding recorded investment   $ 311  
Real Estate Construction Porfolio Segment [Member]      
Number of contracts 1    
Pre-modification outstanding recorded investment $ 181    
Post-modification outstanding recorded investment $ 181    
Commercial Real Estate Portfolio Segment [Member]      
Number of contracts 1   1
Pre-modification outstanding recorded investment $ 270   $ 48
Post-modification outstanding recorded investment $ 270   $ 48
Consumer Portfolio Segment [Member]      
Number of contracts     1
Pre-modification outstanding recorded investment     $ 6
Post-modification outstanding recorded investment     $ 6
Extended Maturity [Member] | Commercial And Industrial [Member]      
Number of contracts 6 5  
Extended Maturity [Member] | Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]      
Number of contracts 5 4 3
Extended Maturity [Member] | Real Estate Mortgage Portfolio Segment [Member] | Commercial Loans [Member]      
Number of contracts   1  
Extended Maturity [Member] | Real Estate Construction Porfolio Segment [Member]      
Number of contracts 1    
Extended Maturity [Member] | Commercial Real Estate Portfolio Segment [Member]      
Number of contracts 1   1
Extended Maturity [Member] | Consumer Portfolio Segment [Member]      
Number of contracts     1
Other Restructurings [Member] | Commercial And Industrial [Member]      
Number of contracts    
Other Restructurings [Member] | Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]      
Number of contracts 1
Other Restructurings [Member] | Real Estate Mortgage Portfolio Segment [Member] | Commercial Loans [Member]      
Number of contracts    
Other Restructurings [Member] | Real Estate Construction Porfolio Segment [Member]      
Number of contracts    
Other Restructurings [Member] | Commercial Real Estate Portfolio Segment [Member]      
Number of contracts  
Other Restructurings [Member] | Consumer Portfolio Segment [Member]      
Number of contracts