Note 4 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans (Details) - Ratios for Allowance for Loan Losses	3 Months Ended				12 Months Ended
	Mar. 31, 2015		Mar. 31, 2014		Dec. 31, 2014
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	1.33%		1.41%		1.36%
Ratio of net charge-offs to average loans, net of unearned income and deferred fees(1)	0.14%	[1]	0.02%	[1]	0.27%	[1]

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