Note 4 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans (Details) - Summary of Ratios for Allowance for Loan Losses	6 Months Ended				12 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Dec. 31, 2012
Summary of Ratios for Allowance for Loan Losses [Abstract]
Ratio of allowance for loan losses to the end of period loans, net of unearned income and deferred fees	1.35%		1.39%		1.41%
Ratio of net charge-offs to average loans, net of unearned income and deferred fees(1)	0.49%	[1]	0.57%	[1]	0.49%	[1]

[1] Net charge-offs are on an annualized basis.