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Note 5 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans (Details) - Troubled Debt Restructurings
$ in Thousands
 12 Months Ended
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Financing Receivable, Modifications [Line Items]    
Number of contracts 6 5
Pre-modification outstanding principal balance $ 3,628 $ 5,761
Post-modification outstanding principal balance [1] $ 3,541 $ 5,843
Real Estate Construction Portfolio Segment[Member] | Construction, 1-4 Family Residential [Member]    
Financing Receivable, Modifications [Line Items]    
Number of contracts 2  
Pre-modification outstanding principal balance $ 718  
Post-modification outstanding principal balance [1] $ 718  
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate, Owner Occupied [Member]    
Financing Receivable, Modifications [Line Items]    
Number of contracts 3 1
Pre-modification outstanding principal balance $ 2,710 $ 184
Post-modification outstanding principal balance [1] $ 2,623 $ 208
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 [1]   $ 2,484
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Non-owner Occupied [Member]    
Financing Receivable, Modifications [Line Items]    
Number of contracts   2
Pre-modification outstanding principal balance   $ 2,967
Post-modification outstanding principal balance [1]   $ 3,008
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]    
Financing Receivable, Modifications [Line Items]    
Number of contracts 1  
Pre-modification outstanding principal balance $ 200  
Post-modification outstanding principal balance [1] $ 200  
Consumer Real Estate Portfolio Segment [Member] | Closed-end First Liens [Member]    
Financing Receivable, Modifications [Line Items]    
Number of contracts   1
Pre-modification outstanding principal balance   $ 126
Post-modification outstanding principal balance [1]   $ 143
[1] Post-modification outstanding recorded investment considers amounts immediately following the modification. Amounts do not reflect balances at the end of the period.