Note 3 - Loans and Allowance for Loan Losses (Detail) - Past Due Loans 30 Days Or More By Class Of Loans (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Total Loans	$ 1,004,995	$ 1,072,108
Real Estate Construction And Land Development [Member]
30-89 Days Past Due	908	3,343
90 Days Or More Past Due	1,361	18,970
Total	2,269	22,313
Current	100,185	97,676
Total Loans	102,454	119,989
Real Estate Mortgage Residential [Member]
30-89 Days Past Due	2,303	3,382
90 Days Or More Past Due	2,500	6,990
Total	4,803	10,372
Current	363,959	386,985
Total Loans	368,762	397,357
Real Estate Mortgage Farmland And Other Commercial Enterprises [Member]
30-89 Days Past Due	1,990	4,138
90 Days Or More Past Due	10,724	12,859
Total	12,714	16,997
Current	412,763	415,441
Total Loans	425,477	432,438
Commercial And Industrial [Member]
30-89 Days Past Due	108	98
90 Days Or More Past Due	53	300
Total	161	398
Current	46,651	48,373
Total Loans	46,812	48,771
States and Political Subdivisions [Member]
Current	21,472	23,601
Total Loans	21,472	23,601
Lease Financing [Member]
30-89 Days Past Due	1	80
90 Days Or More Past Due	53	96
Total	54	176
Current	2,561	6,976
Total Loans	2,615	7,152
Commercial Other [Member]
30-89 Days Past Due	38	29
90 Days Or More Past Due	399
Total	437	29
Current	18,719	21,406
Total Loans	19,156	21,435
Consumer Secured [Member]
30-89 Days Past Due	69	200
90 Days Or More Past Due		17
Total	69	217
Current	11,663	13,997
Total Loans	11,732	14,214
Consumer Unsecured [Member]
30-89 Days Past Due	137	61
90 Days Or More Past Due		5
Total	137	66
Current	6,378	7,085
Total Loans	6,515	7,151
Total [Member]
30-89 Days Past Due	5,554	11,331
90 Days Or More Past Due	15,090	39,237
Total	20,644	50,568
Current	984,351	1,021,540
Total Loans	$ 1,004,995	$ 1,072,108