Note 7 - Loans and Allowance for Loan Losses (Details) - Risk Category of Loans by Class (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 953,832	$ 999,883
Real Estate Construction And Land Development [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	77,703	77,873
Real Estate Construction And Land Development [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	5,166	7,755
Real Estate Construction And Land Development [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	14,401	15,724
Real Estate Construction And Land Development [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Real Estate Construction And Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	97,270	101,352
Real Estate Mortgage Residential [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	325,540	334,104
Real Estate Mortgage Residential [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	15,035	15,120
Real Estate Mortgage Residential [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	20,740	22,358
Real Estate Mortgage Residential [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Real Estate Mortgage Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	361,315	371,582
Real Estate Mortgage Farmland And Other Commercial Enterprises [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	328,846	352,238
Real Estate Mortgage Farmland And Other Commercial Enterprises [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	23,616	29,156
Real Estate Mortgage Farmland And Other Commercial Enterprises [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	29,858	36,753
Real Estate Mortgage Farmland And Other Commercial Enterprises [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	469	0
Real Estate Mortgage Farmland And Other Commercial Enterprises [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	382,789	418,147
Commercial And Industrial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	52,185	45,652
Commercial And Industrial [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	964	963
Commercial And Industrial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	710	735
Commercial And Industrial [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	0	76
Commercial And Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	53,859	47,426
States and Political Subdivisions [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	24,355	21,561
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]
Financing Receivable, Recorded Investment [Line Items]
Loans	24,355	21,561
Lease Financing [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	239	861
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	0	22
Lease Financing [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Lease Financing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	239	883
Commercial Other [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	20,004	23,820
Commercial Other [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	11	0
Commercial Other [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	7	20
Commercial Other [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Commercial Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 20,022	$ 23,840