Note 4 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans (Details) - Nonperforming Assets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015		Dec. 31, 2014		Mar. 31, 2014
Nonperforming Assets [Abstract]
Nonaccrual loans	$ 3,102		$ 3,999		$ 5,071
Restructured loans in nonaccrual	6,123		5,288		1,007
Total nonperforming loans	9,225	[1]	9,287	[1]	6,078
Other real estate owned, net	4,573		4,744		4,901
Total nonperforming assets	$ 13,798		$ 14,031		$ 10,979
Ratio of nonperforming assets to loans, net of unearned income and deferred fees, plus other real estate owned	2.20%		2.30%		1.85%
Ratio of allowance for loan losses to nonperforming loans(1)	89.51%	[2]	88.97%	[2]	136.51%	[2]

[1] Only classes with past-due or nonaccrual loans are shown.

[2] The Company defines nonperforming loans as nonaccrual loans. Loans 90 days or more past due and still accruing and accruing restructured loans are excluded.