Note 8 - Loans and Allowance for Loan Losses (Detail) - Recorded Investment In Nonperforming Loans By Class Of Loans (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Real Estate Construction And Land Development [Member]
Nonaccrual	$ 6,693	$ 7,700
Restructured Loans	6,678	8,736
Real Estate Mortgage Residential [Member]
Nonaccrual	6,143	6,025
Restructured Loans	2,953	634
Loans Past Due 90 Days Or More And Still Accruing	82
Real Estate Mortgage Farmland And Other Commercial Enterprises [Member]
Nonaccrual	14,473	12,878
Restructured Loans	16,860	16,940
Loans Past Due 90 Days Or More And Still Accruing		103
Commercial And Industrial [Member]
Nonaccrual	608	649
Lease Financing [Member]
Nonaccrual	47	53
Consumer Secured [Member]
Nonaccrual	29	9
Consumer Unsecured [Member]
Nonaccrual	1	94
Restructured Loans	38	39
Total [Member]
Nonaccrual	27,994	27,408
Restructured Loans	26,529	26,349
Loans Past Due 90 Days Or More And Still Accruing	$ 82	$ 103