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Note 7 - Loans and Allowance for Loan Losses (Details) - Troubled Debt Restructurings
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2015
USD ($)
Dec. 31, 2014
Commercial:      
Number of Loans 0 3 0
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