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Note 4 - Loans and Allowance for Loan Losses (Details) - Troubled Debt Restructurings
$ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
Commercial:  
Number of loans 3
Pre-modification outstanding recorded investment $ 533
Post-modification outstanding recorded investment $ 533
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]  
Commercial:  
Number of loans 2
Pre-modification outstanding recorded investment $ 388
Post-modification outstanding recorded investment $ 388
Consumer Portfolio Segment [Member] | Consumer Secured [Member]  
Commercial:  
Number of loans 1
Pre-modification outstanding recorded investment $ 145
Post-modification outstanding recorded investment $ 145