Note 3 - Loans and Allowance for Loan Losses (Details) - Risk Category of Loans by Class (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 999,883	$ 1,004,995
Real Estate Construction And Land Development [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	77,873	68,721
Real Estate Construction And Land Development [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	7,755	7,562
Real Estate Construction And Land Development [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	15,724	26,171
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	101,352	102,454
Real Estate Construction And Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	101,352	102,454
Real Estate Mortgage Residential [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	334,104	328,214
Real Estate Mortgage Residential [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	15,120	18,485
Real Estate Mortgage Residential [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	22,358	21,984
Real Estate Mortgage Residential [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	0	79
Real Estate Mortgage Residential [Member] | Total [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	371,582	368,762
Real Estate Mortgage Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	371,582	368,762
Real Estate Mortgage Farmland And Other Commercial Enterprises [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	352,238	348,918
Real Estate Mortgage Farmland And Other Commercial Enterprises [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	29,156	35,027
Real Estate Mortgage Farmland And Other Commercial Enterprises [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	36,753	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	418,147	425,477
Real Estate Mortgage Farmland And Other Commercial Enterprises [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	418,147	425,477
Commercial And Industrial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	45,652	41,527
Commercial And Industrial [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	963	4,201
Commercial And Industrial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	735	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	47,426	46,812
Commercial And Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	47,426	46,812
States and Political Subdivisions [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	21,561	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	21,561	21,472
States and Political Subdivisions [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	21,561	21,472
Lease Financing [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	861	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	22	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	883	2,615
Lease Financing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	883	2,615
Commercial Other [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	23,820	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	20	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	23,840	19,156
Commercial Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 23,840	$ 19,156