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Note 4 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans (Details) - Troubled Debt Restructurings
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Financing Receivable, Modifications [Line Items]        
Number of contracts 0 0   2
Commercial Real Estate Portfolio Segment [Member]        
Financing Receivable, Modifications [Line Items]        
Number of contracts     1 2
Pre-modification outstanding principal balance     $ 994 $ 2,668
Post-modification outstanding principal balance     $ 907 $ 2,693
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate, Owner Occupied [Member]        
Financing Receivable, Modifications [Line Items]        
Number of contracts     1 1
Pre-modification outstanding principal balance     $ 994 $ 184
Post-modification outstanding principal balance     $ 907 $ 209
Commercial Real Estate Portfolio Segment [Member] | Multifamily Real Estate [Member]        
Financing Receivable, Modifications [Line Items]        
Number of contracts       1
Pre-modification outstanding principal balance       $ 2,484
Post-modification outstanding principal balance       $ 2,484