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Note 4 - Loans and Related Allowance for Loan Losses (Details) - Troubled Debt Restructurings Subsequently Defaulted
$ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Commercial and Industrial [Member]      
Financing Receivable, Modifications [Line Items]      
Number of contracts 2   5
Recorded investment $ 14   $ 574
Real Estate Construction Porfolio Segment [Member]      
Financing Receivable, Modifications [Line Items]      
Number of contracts 1    
Recorded investment $ 130    
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]      
Financing Receivable, Modifications [Line Items]      
Number of contracts   1  
Recorded investment   $ 15  
Real Estate Mortgage Portfolio Segment [Member] | Commercial Loans [Member]      
Financing Receivable, Modifications [Line Items]      
Number of contracts     1
Recorded investment     $ 190