Note 4 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans (Details) - Summary of Nonperforming Assets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013		Dec. 31, 2012		Jun. 30, 2012
Summary of Nonperforming Assets [Abstract]
Nonaccrual loans	$ 10,428		$ 10,870		$ 3,627
Restructured loans in nonaccrual	1,522		2,151		3,763
Total nonperforming loans	11,950		13,021		7,390
Other real estate owned, net	969		1,435		871
Total nonperforming assets	$ 12,919		$ 14,456		$ 8,261
Ratio of nonperforming assets to loans, net of unearned income and deferred fees, plus other real estate owned	2.19%		2.44%		1.41%
Ratio of allowance for loan losses to nonperforming loans(1)	66.54%	[1]	64.12%	[1]	110.53%	[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.