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Note 4 - Loans and Allowance for Loan Losses (Details) - Troubled Debt Restructurings During the Period
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2015
Jun. 30, 2014
USD ($)
Troubled debt restructurings:      
Number of contracts 0 0 3
Pre-modification outstanding balance     $ 542
Post-modification outstanding balance     $ 542
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]      
Troubled debt restructurings:      
Number of contracts     3
Pre-modification outstanding balance     $ 542
Post-modification outstanding balance     $ 542