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Note 5 - Loans (Details) - Troubled Debt Restructurings
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Financing Receivable, Modifications [Line Items]        
Number of contracts 120 13 7 24
Pre-modification outstanding recorded investment   $ 2,109 $ 9,368 $ 17,338
Post-modification outstanding recorded investment   $ 1,895 $ 9,372 $ 16,768
Commercial Portfolio Segment [Member]        
Financing Receivable, Modifications [Line Items]        
Number of contracts   2 2 3
Pre-modification outstanding recorded investment   $ 872 $ 9,070 $ 6,837
Post-modification outstanding recorded investment   $ 872 $ 9,070 $ 6,638
Residential Portfolio Segment [Member] | Home Equity Loan [Member]        
Financing Receivable, Modifications [Line Items]        
Number of contracts       2
Pre-modification outstanding recorded investment       $ 165
Post-modification outstanding recorded investment       $ 166
Residential Portfolio Segment [Member] | Individual Tax Identification Number Loan [Member] | Real Estate Loan [Member]        
Financing Receivable, Modifications [Line Items]        
Number of contracts   11 4 15
Pre-modification outstanding recorded investment   $ 1,237 $ 263 $ 1,286
Post-modification outstanding recorded investment   $ 1,023 $ 267 $ 1,360
Consumer Portfolio Segment [Member]        
Financing Receivable, Modifications [Line Items]        
Number of contracts     1  
Pre-modification outstanding recorded investment     $ 35  
Post-modification outstanding recorded investment     $ 35  
Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]        
Financing Receivable, Modifications [Line Items]        
Number of contracts       3
Pre-modification outstanding recorded investment       $ 8,132
Post-modification outstanding recorded investment       $ 8,186
Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]        
Financing Receivable, Modifications [Line Items]        
Number of contracts       1
Pre-modification outstanding recorded investment       $ 918
Post-modification outstanding recorded investment       $ 418