Note 5 - Valuation Allowance on Foreclosed Properties (Detail) - Major Classification of Other Real Estate Owned in Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Construction:
Other real estate owned	$ 8,938	$ 9,562	$ 2,976
Construction Residential [Member]
Construction:
Other real estate owned	588	1,447
Land Acquistion, Development and Commercial [Member]
Construction:
Other real estate owned	3,591	3,805
Real Estate Residential [Member]
Construction:
Other real estate owned	182	612
Real Estate Commercial [Member]
Construction:
Other real estate owned	2,905	1,919
Commercial, Industrial and Agricultural [Member]
Construction:
Other real estate owned	1,164	1,215
Equity Lines [Member]
Construction:
Other real estate owned	$ 508	$ 564