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Note 4 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans (Details) - Ratios of Allowance for Loan Losses
 6 Months Ended 12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Ratios of Allowance for Loan Losses [Abstract]      
Ratio of allowance for loan losses to the end of period loans, net of unearned income and deferred fees 1.30% 1.34% 1.36%
Ratio of net charge-offs to average loans, net of unearned income and deferred fees(1) [1] 0.22% 0.36% 0.27%
[1] Net charge-offs are on an annualized basis.