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	Sep. 30, 2012	Dec. 31, 2011
Loans	$ 1,018,311	$ 1,072,108
Real Estate Construction And Land Development [Member] | Pass [Member]
Loans	72,675	65,306
Real Estate Construction And Land Development [Member] | Special Mention [Member]
Loans	7,576	7,443
Real Estate Construction And Land Development [Member] | Substandard [Member]
Loans	35,073	47,091
Real Estate Construction And Land Development [Member] | Doubtful [Member]
Loans		149
Real Estate Construction And Land Development [Member] | Total [Member]
Loans	115,324	119,989
Real Estate Construction And Land Development [Member]
Loans	115,324	119,989
Real Estate Mortgage Residential [Member] | Pass [Member]
Loans	366,496	386,134
Real Estate Mortgage Residential [Member] | Special Mention [Member]
Loans	19,467	16,585
Real Estate Mortgage Residential [Member] | Substandard [Member]
Loans	27,172	41,468
Real Estate Mortgage Residential [Member] | Doubtful [Member]
Loans	149	1,277
Real Estate Mortgage Residential [Member] | Total [Member]
Loans	413,284	445,464
Real Estate Mortgage Residential [Member]
Loans	413,284	445,464
Real Estate Mortgage Farmland And Other Commercial Enterprises [Member] | Pass [Member]
Loans	296,834	303,512
Real Estate Mortgage Farmland And Other Commercial Enterprises [Member] | Special Mention [Member]
Loans	31,254	19,393
Real Estate Mortgage Farmland And Other Commercial Enterprises [Member] | Substandard [Member]
Loans	47,976	59,395
Real Estate Mortgage Farmland And Other Commercial Enterprises [Member] | Doubtful [Member]
Loans	1,632	2,031
Real Estate Mortgage Farmland And Other Commercial Enterprises [Member] | Total [Member]
Loans	377,696	384,331
Real Estate Mortgage Farmland And Other Commercial Enterprises [Member]
Loans	377,696	384,331
Commercial And Industrial [Member] | Pass [Member]
Loans	41,249	41,556
Commercial And Industrial [Member] | Special Mention [Member]
Loans	6,159	2,969
Commercial And Industrial [Member] | Substandard [Member]
Loans	968	4,103
Commercial And Industrial [Member] | Doubtful [Member]
Loans	76	143
Commercial And Industrial [Member] | Total [Member]
Loans	48,452	48,771
Commercial And Industrial [Member]
Loans	48,452	48,771
States and Political Subdivisions [Member] | Pass [Member]
Loans	22,489	23,601
States and Political Subdivisions [Member] | Total [Member]
Loans	22,489	23,601
States and Political Subdivisions [Member]
Loans	22,489	23,601
Lease Financing [Member] | Pass [Member]
Loans	3,187	7,022
Lease Financing [Member] | Special Mention [Member]
Loans		6
Lease Financing [Member] | Substandard [Member]
Loans	162	124
Lease Financing [Member] | Total [Member]
Loans	3,349	7,152
Lease Financing [Member]
Loans	3,349	7,152
Commercial Other [Member] | Pass [Member]
Loans	18,532	20,415
Commercial Other [Member] | Special Mention [Member]
Loans	492	1,000
Commercial Other [Member] | Substandard [Member]
Loans	8	20
Commercial Other [Member] | Total [Member]
Loans	19,032	21,435
Commercial Other [Member]
Loans	$ 19,032	$ 21,435