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Note 5 - Loans by Loan Class Modified as TDRs (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2017
contract
Dec. 31, 2016
USD ($)
contract
Financing Receivable Modifications [Line Items]    
Number of contracts | contract 0 16
Pre-modification outstanding recorded investment   $ 3,840
Post-modification outstanding recorded investment   $ 3,683
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]    
Financing Receivable Modifications [Line Items]    
Number of contracts | contract   7
Pre-modification outstanding recorded investment   $ 1,099
Post-modification outstanding recorded investment   $ 1,020
Commercial Portfolio Segment [Member] | Secured by Commercial Real Estate [Member]    
Financing Receivable Modifications [Line Items]    
Number of contracts | contract   2
Pre-modification outstanding recorded investment   $ 1,296
Post-modification outstanding recorded investment   $ 1,251
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
2017 | contract   1
2017   $ 111
Retail Portfolio Segment [Member] | Family Residential Mortgages [Member]    
Financing Receivable Modifications [Line Items]    
Number of contracts | contract   1
Pre-modification outstanding recorded investment   $ 193
Post-modification outstanding recorded investment   $ 193
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