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Note 5 - Loans by Loan Class Modified as TDRs (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
contract
Dec. 31, 2015
USD ($)
contract
Financing Receivable Modifications [Line Items]    
Number of contracts | contract 16 3
Pre-modification outstanding recorded investment $ 3,840 $ 589
Post-modification outstanding recorded investment $ 3,683 $ 584
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]    
Financing Receivable Modifications [Line Items]    
Number of contracts | contract 7 1
Pre-modification outstanding recorded investment $ 1,099 $ 47
Post-modification outstanding recorded investment $ 1,020 $ 46
Commercial Portfolio Segment [Member] | Secured by Commercial Real Estate [Member]    
Financing Receivable Modifications [Line Items]    
Number of contracts | contract 2 1
Pre-modification outstanding recorded investment $ 1,296 $ 400
Post-modification outstanding recorded investment $ 1,251 $ 397
Commercial Portfolio Segment [Member] | Secured by Residential Real Estate [Member]    
Financing Receivable Modifications [Line Items]    
Number of contracts | contract 5  
Pre-modification outstanding recorded investment $ 1,156  
Post-modification outstanding recorded investment $ 1,126  
Number of contracts | contract 1  
Recorded investment $ 111  
Retail Portfolio Segment [Member] | Family Residential Mortgages [Member]    
Financing Receivable Modifications [Line Items]    
Number of contracts | contract 1 1
Pre-modification outstanding recorded investment $ 193 $ 142
Post-modification outstanding recorded investment $ 193 $ 141
Consumer [Member] | Retail Portfolio Segment [Member]    
Financing Receivable Modifications [Line Items]    
Number of contracts | contract 1  
Pre-modification outstanding recorded investment $ 96  
Post-modification outstanding recorded investment $ 93