Note 7 - Loans and Allowance for Loan Losses (Detail) - Loans Not Meeting The Criteria Above Which Are Analyzed Individually As Part Of The Above Described Process Are Considered To Be Pass Rated Loans (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Loans	$ 1,040,439	$ 1,072,108
Real Estate Construction And Land Development [Member] | Pass [Member]
Loans	68,258	65,306
Real Estate Construction And Land Development [Member] | Special Mention [Member]
Loans	6,802	7,443
Real Estate Construction And Land Development [Member] | Substandard [Member]
Loans	41,341	47,091
Real Estate Construction And Land Development [Member] | Doubtful [Member]
Loans		149
Real Estate Construction And Land Development [Member] | Total [Member]
Loans	116,401	119,989
Real Estate Construction And Land Development [Member]
Loans	116,401	119,989
Real Estate Mortgage Residential [Member] | Pass [Member]
Loans	379,228	386,134
Real Estate Mortgage Residential [Member] | Special Mention [Member]
Loans	18,671	16,585
Real Estate Mortgage Residential [Member] | Substandard [Member]
Loans	31,821	41,468
Real Estate Mortgage Residential [Member] | Doubtful [Member]
Loans	931	1,277
Real Estate Mortgage Residential [Member] | Total [Member]
Loans	430,651	445,464
Real Estate Mortgage Residential [Member]
Loans	430,651	445,464
Real Estate Mortgage Farmland And Other Commercial Enterprises [Member] | Pass [Member]
Loans	300,697	303,512
Real Estate Mortgage Farmland And Other Commercial Enterprises [Member] | Special Mention [Member]
Loans	28,905	19,393
Real Estate Mortgage Farmland And Other Commercial Enterprises [Member] | Substandard [Member]
Loans	49,318	59,395
Real Estate Mortgage Farmland And Other Commercial Enterprises [Member] | Doubtful [Member]
Loans	1,922	2,031
Real Estate Mortgage Farmland And Other Commercial Enterprises [Member] | Total [Member]
Loans	380,842	384,331
Real Estate Mortgage Farmland And Other Commercial Enterprises [Member]
Loans	380,842	384,331
Commercial And Industrial [Member] | Pass [Member]
Loans	40,832	41,556
Commercial And Industrial [Member] | Special Mention [Member]
Loans	5,866	2,969
Commercial And Industrial [Member] | Substandard [Member]
Loans	998	4,103
Commercial And Industrial [Member] | Doubtful [Member]
Loans		143
Commercial And Industrial [Member] | Total [Member]
Loans	47,696	48,771
Commercial And Industrial [Member]
Loans	47,696	48,771
States and Political Subdivisions [Member] | Pass [Member]
Loans	22,779	23,601
States and Political Subdivisions [Member] | Total [Member]
Loans	22,779	23,601
States and Political Subdivisions [Member]
Loans	22,779	23,601
Lease Financing [Member] | Pass [Member]
Loans	4,306	7,022
Lease Financing [Member] | Special Mention [Member]
Loans		6
Lease Financing [Member] | Substandard [Member]
Loans	161	124
Lease Financing [Member] | Total [Member]
Loans	4,467	7,152
Lease Financing [Member]
Loans	4,467	7,152
Commercial Other [Member] | Pass [Member]
Loans	17,529	20,415
Commercial Other [Member] | Special Mention [Member]
Loans	1,067	1,000
Commercial Other [Member] | Substandard [Member]
Loans	11	20
Commercial Other [Member] | Total [Member]
Loans	18,607	21,435
Commercial Other [Member]
Loans	$ 18,607	$ 21,435