Note 7 - Loans and Allowance for Loan Losses (Details) - Risk Category of Loans by Class - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Credit risk profile by internally assigned rating grades:
Loans	$ 933,305	$ 931,943
Real Estate Portfolio Segment [Member]
Credit risk profile by internally assigned rating grades:
Loans	828,337	833,344
Real Estate Portfolio Segment [Member] | Real Estate Construction and Land Development [Member]
Credit risk profile by internally assigned rating grades:
Loans	105,911	97,045
Real Estate Portfolio Segment [Member] | Real Estate Construction and Land Development [Member] | Pass [Member]
Credit risk profile by internally assigned rating grades:
Loans	90,470	81,438
Real Estate Portfolio Segment [Member] | Real Estate Construction and Land Development [Member] | Special Mention [Member]
Credit risk profile by internally assigned rating grades:
Loans	4,200	2,674
Real Estate Portfolio Segment [Member] | Real Estate Construction and Land Development [Member] | Substandard [Member]
Credit risk profile by internally assigned rating grades:
Loans	11,241	12,933
Real Estate Portfolio Segment [Member] | Real Estate Construction and Land Development [Member] | Doubtful [Member]
Credit risk profile by internally assigned rating grades:
Loans	0	0
Real Estate Portfolio Segment [Member] | Real Estate Mortgage Residential [Member]
Credit risk profile by internally assigned rating grades:
Loans	353,132	361,022
Real Estate Portfolio Segment [Member] | Real Estate Mortgage Residential [Member] | Pass [Member]
Credit risk profile by internally assigned rating grades:
Loans	319,315	326,124
Real Estate Portfolio Segment [Member] | Real Estate Mortgage Residential [Member] | Special Mention [Member]
Credit risk profile by internally assigned rating grades:
Loans	14,337	16,429
Real Estate Portfolio Segment [Member] | Real Estate Mortgage Residential [Member] | Substandard [Member]
Credit risk profile by internally assigned rating grades:
Loans	19,480	18,469
Real Estate Portfolio Segment [Member] | Real Estate Mortgage Residential [Member] | Doubtful [Member]
Credit risk profile by internally assigned rating grades:
Loans	0	0
Real Estate Portfolio Segment [Member] | Real Estate Mortgage Farmland and Other Commercial Enterprises [Member]
Credit risk profile by internally assigned rating grades:
Loans	369,294	375,277
Real Estate Portfolio Segment [Member] | Real Estate Mortgage Farmland and Other Commercial Enterprises [Member] | Pass [Member]
Credit risk profile by internally assigned rating grades:
Loans	325,928	327,019
Real Estate Portfolio Segment [Member] | Real Estate Mortgage Farmland and Other Commercial Enterprises [Member] | Special Mention [Member]
Credit risk profile by internally assigned rating grades:
Loans	25,606	27,855
Real Estate Portfolio Segment [Member] | Real Estate Mortgage Farmland and Other Commercial Enterprises [Member] | Substandard [Member]
Credit risk profile by internally assigned rating grades:
Loans	17,760	19,941
Real Estate Portfolio Segment [Member] | Real Estate Mortgage Farmland and Other Commercial Enterprises [Member] | Doubtful [Member]
Credit risk profile by internally assigned rating grades:
Loans	0	462
Commercial Portfolio Segment [Member]
Credit risk profile by internally assigned rating grades:
Loans	92,733	85,186
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Credit risk profile by internally assigned rating grades:
Loans	52,313	47,112
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Pass [Member]
Credit risk profile by internally assigned rating grades:
Loans	50,851	45,665
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Special Mention [Member]
Credit risk profile by internally assigned rating grades:
Loans	981	946
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Substandard [Member]
Credit risk profile by internally assigned rating grades:
Loans	481	501
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Doubtful [Member]
Credit risk profile by internally assigned rating grades:
Loans	0	0
Commercial Portfolio Segment [Member] | States and Political Subdivisions [Member]
Credit risk profile by internally assigned rating grades:
Loans	21,037	22,369
Commercial Portfolio Segment [Member] | States and Political Subdivisions [Member] | Pass [Member]
Credit risk profile by internally assigned rating grades:
Loans	21,037	22,369
Commercial Portfolio Segment [Member] | States and Political Subdivisions [Member] | Special Mention [Member]
Credit risk profile by internally assigned rating grades:
Loans	0	0
Commercial Portfolio Segment [Member] | States and Political Subdivisions [Member] | Substandard [Member]
Credit risk profile by internally assigned rating grades:
Loans	0	0
Commercial Portfolio Segment [Member] | States and Political Subdivisions [Member] | Doubtful [Member]
Credit risk profile by internally assigned rating grades:
Loans	0	0
Commercial Portfolio Segment [Member] | Lease Financing [Member]
Credit risk profile by internally assigned rating grades:
Loans	50	158
Commercial Portfolio Segment [Member] | Lease Financing [Member] | Pass [Member]
Credit risk profile by internally assigned rating grades:
Loans	50	158
Commercial Portfolio Segment [Member] | Lease Financing [Member] | Special Mention [Member]
Credit risk profile by internally assigned rating grades:
Loans	0	0
Commercial Portfolio Segment [Member] | Lease Financing [Member] | Substandard [Member]
Credit risk profile by internally assigned rating grades:
Loans	0	0
Commercial Portfolio Segment [Member] | Lease Financing [Member] | Doubtful [Member]
Credit risk profile by internally assigned rating grades:
Loans	0	0
Commercial Portfolio Segment [Member] | Commercial Other [Member]
Credit risk profile by internally assigned rating grades:
Loans	19,333	15,547
Commercial Portfolio Segment [Member] | Commercial Other [Member] | Pass [Member]
Credit risk profile by internally assigned rating grades:
Loans	19,310	15,526
Commercial Portfolio Segment [Member] | Commercial Other [Member] | Special Mention [Member]
Credit risk profile by internally assigned rating grades:
Loans	0	14
Commercial Portfolio Segment [Member] | Commercial Other [Member] | Substandard [Member]
Credit risk profile by internally assigned rating grades:
Loans	23	7
Commercial Portfolio Segment [Member] | Commercial Other [Member] | Doubtful [Member]
Credit risk profile by internally assigned rating grades:
Loans	$ 0	$ 0