Note 15 - Disclosures About Fair Value of Financial Instruments (Detail) (USD $)			12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Commercial And Residential Real Estate Collateral [Member] Minimum [Member]	Dec. 31, 2012 Commercial And Residential Real Estate Collateral [Member] Maximum [Member]	Dec. 31, 2012 Special Mention Or Worse [Member]	Dec. 31, 2012 Collateral Dependent Loans [Member]	Dec. 31, 2011 Collateral Dependent Loans [Member]	Dec. 31, 2012 Foreclosed Assets Not Covered By FDIC Loss Share [Member]	Dec. 31, 2011 Foreclosed Assets Not Covered By FDIC Loss Share [Member]
Collateral Dependent Loans, Amount At Which Testing Begins					$ 500,000
Collateral Dependent Loans, Amount At Which All Loans Are Tested					1,500,000
Assets Held-for-sale, at Carrying Value								33,400,000	22,900,000
Collateral Discounts			10.00%	40.00%
Impaired Financing Receivable, Related Allowance	$ 2,800,000	$ 3,500,000				$ 219,000	$ 41,000