Note 7 - Loans and Allowance for Loan Losses (Details) - Risk Category of Loans by Class (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 970,179	$ 999,883
Real Estate Construction And Land Development [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	75,835	77,873
Real Estate Construction And Land Development [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	7,207	7,755
Real Estate Construction And Land Development [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	14,727	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] | Total [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	97,769	101,352
Real Estate Construction And Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	97,769	101,352
Real Estate Mortgage Residential [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	332,358	334,104
Real Estate Mortgage Residential [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	12,219	15,120
Real Estate Mortgage Residential [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	21,392	22,358
Real Estate Mortgage Residential [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Real Estate Mortgage Residential [Member] | Total [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	365,969	371,582
Real Estate Mortgage Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	365,969	371,582
Real Estate Mortgage Farmland And Other Commercial Enterprises [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	345,066	352,238
Real Estate Mortgage Farmland And Other Commercial Enterprises [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	16,532	29,156
Real Estate Mortgage Farmland And Other Commercial Enterprises [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	30,837	36,753
Real Estate Mortgage Farmland And Other Commercial Enterprises [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	475	0
Real Estate Mortgage Farmland And Other Commercial Enterprises [Member] | Total [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	392,910	418,147
Real Estate Mortgage Farmland And Other Commercial Enterprises [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	392,910	418,147
Commercial And Industrial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	50,930	45,652
Commercial And Industrial [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	785	963
Commercial And Industrial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	998	735
Commercial And Industrial [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	0	76
Commercial And Industrial [Member] | Total [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	52,713	47,426
Commercial And Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	52,713	47,426
States and Political Subdivisions [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	25,150	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] | Total [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	25,150	21,561
States and Political Subdivisions [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	25,150	21,561
Lease Financing [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	393	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] | Total [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	393	883
Lease Financing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	393	883
Commercial Other [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	20,691	23,820
Commercial Other [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	59	0
Commercial Other [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	19	20
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	20,769	23,840
Commercial Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 20,769	$ 23,840