Note 3 - Loans and Allowance for Loan Losses (Detail) - Recorded Investment In Nonaccrual Loans (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Recorded Investment In Nonaccrual Loans	$ 21,598	$ 28,577
Commercial And Industrial [Member]
Recorded Investment In Nonaccrual Loans	579	1,308
Real Estate Mortgage Residential [Member]
Recorded Investment In Nonaccrual Loans	142	239
Real Estate Mortgage Commercial [Member]
Recorded Investment In Nonaccrual Loans	16,347	22,501
Real Estate Construction Residential [Member]
Recorded Investment In Nonaccrual Loans	1,426	1,426
Real Estate Construction Commercial [Member]
Recorded Investment In Nonaccrual Loans	$ 3,104	$ 3,103