Note 10 - Fair Value Measurements (Detail) - Fair Value of Financial Assets and Liabililties Measure on Non-Recurring Basis (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Impaired loans, net of valuation allowance	$ 1,130	$ 3,455
Other real estate owned	8,938	9,562	2,976
Fair Value, Inputs, Level 2 [Member]
Impaired loans, net of valuation allowance	62	2,387
Other real estate owned	4,382	9,562
Fair Value, Inputs, Level 3 [Member]
Impaired loans, net of valuation allowance	1,068	1,068
Other real estate owned	$ 4,556