Note 4 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans (Details) - Summary of Nonperforming Assets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013		Dec. 31, 2012		Sep. 30, 2012
Summary of Nonperforming Assets [Abstract]
Nonaccrual loans	$ 10,194		$ 10,870		$ 3,876
Restructured loans in nonaccrual	1,042		2,151		2,254
Total nonperforming loans	11,236		13,021		6,130
Other real estate owned, net	973		1,435		1,894
Total nonperforming assets	$ 12,209		$ 14,456		$ 8,024
Ratio of nonperforming assets to loans, net of unearned income and deferred fees, plus other real estate owned	2.06%		2.44%		1.35%
Ratio of allowance for loan losses to nonperforming loans(1)	72.00%	[1]	64.12%	[1]	134.65%	[1]

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