Note 8 - Loans and Allowance for Loan Losses (Details) - Risk Category of Loans by Class (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 1,010,131	$ 1,004,995
Real Estate Construction And Land Development [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	83,183	68,721
Real Estate Construction And Land Development [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	6,282	7,562
Real Estate Construction And Land Development [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	17,345	26,171
Real Estate Construction And Land Development [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	60	0
Real Estate Construction And Land Development [Member] | Total [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	106,870	102,454
Real Estate Construction And Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	106,870	102,454
Real Estate Mortgage Residential [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	334,591	328,214
Real Estate Mortgage Residential [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	14,925	18,485
Real Estate Mortgage Residential [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	21,686	21,984
Real Estate Mortgage Residential [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	90	79
Real Estate Mortgage Residential [Member] | Total [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	371,292	368,762
Real Estate Mortgage Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	371,292	368,762
Real Estate Mortgage Farmland And Other Commercial Enterprises [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	347,472	348,918
Real Estate Mortgage Farmland And Other Commercial Enterprises [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	29,307	35,027
Real Estate Mortgage Farmland And Other Commercial Enterprises [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	41,911	41,532
Real Estate Mortgage Farmland And Other Commercial Enterprises [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Real Estate Mortgage Farmland And Other Commercial Enterprises [Member] | Total [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	418,690	425,477
Real Estate Mortgage Farmland And Other Commercial Enterprises [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	418,690	425,477
Commercial And Industrial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	45,604	41,527
Commercial And Industrial [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	351	4,201
Commercial And Industrial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,402	1,008
Commercial And Industrial [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	76	76
Commercial And Industrial [Member] | Total [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	47,433	46,812
Commercial And Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	47,433	46,812
States and Political Subdivisions [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	22,849	21,472
States and Political Subdivisions [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
States and Political Subdivisions [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
States and Political Subdivisions [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
States and Political Subdivisions [Member] | Total [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	22,849	21,472
States and Political Subdivisions [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	22,849	21,472
Lease Financing [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,205	2,615
Lease Financing [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Lease Financing [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	29	0
Lease Financing [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Lease Financing [Member] | Total [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,234	2,615
Lease Financing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,234	2,615
Commercial Other [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	26,299	18,592
Commercial Other [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	0	559
Commercial Other [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	28	5
Commercial Other [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Commercial Other [Member] | Total [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	26,327	19,156
Commercial Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 26,327	$ 19,156