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Note 5 - Allowance for Loan Losses (Details) - Loans by Credit Quality Indicators (USD $)
Jun. 30, 2014
Dec. 31, 2013
Note 5 - Allowance for Loan Losses (Details) - Loans by Credit Quality Indicators [Line Items]    
Loans $ 542,456,000 [1] $ 542,660,000 [2]
Real Estate - Residential Mortgage [Member] | Pass [Member]
    
Note 5 - Allowance for Loan Losses (Details) - Loans by Credit Quality Indicators [Line Items]    
Loans 172,699,000 180,670,000
Real Estate - Residential Mortgage [Member] | Special Mention [Member]
    
Note 5 - Allowance for Loan Losses (Details) - Loans by Credit Quality Indicators [Line Items]    
Loans 1,975,000 2,209,000
Real Estate - Residential Mortgage [Member] | Substandard [Member]
    
Note 5 - Allowance for Loan Losses (Details) - Loans by Credit Quality Indicators [Line Items]    
Loans 3,687,000 3,580,000
Real Estate - Residential Mortgage [Member] | Substandard Nonaccural [Member]
    
Note 5 - Allowance for Loan Losses (Details) - Loans by Credit Quality Indicators [Line Items]    
Loans 2,153,000 1,996,000
Real Estate - Residential Mortgage [Member]
    
Note 5 - Allowance for Loan Losses (Details) - Loans by Credit Quality Indicators [Line Items]    
Loans 180,514,000 [1] 188,455,000 [2]
Real Estate Construction [Member] | Construction Lending [Member] | Pass [Member]
    
Note 5 - Allowance for Loan Losses (Details) - Loans by Credit Quality Indicators [Line Items]    
Loans 1,759,000 1,068,000
Real Estate Construction [Member] | Construction Lending [Member] | Special Mention [Member]
    
Note 5 - Allowance for Loan Losses (Details) - Loans by Credit Quality Indicators [Line Items]    
Loans   11,000
Real Estate Construction [Member] | Construction Lending [Member] | Substandard [Member]
    
Note 5 - Allowance for Loan Losses (Details) - Loans by Credit Quality Indicators [Line Items]    
Loans 2,649,000 2,649,000
Real Estate Construction [Member] | Construction Lending [Member]
    
Note 5 - Allowance for Loan Losses (Details) - Loans by Credit Quality Indicators [Line Items]    
Loans 4,408,000 [1] 3,728,000 [2]
Real Estate Construction [Member] | Consumer Lot Lending [Member] | Pass [Member]
    
Note 5 - Allowance for Loan Losses (Details) - Loans by Credit Quality Indicators [Line Items]    
Loans 3,085,000 1,831,000
Real Estate Construction [Member] | Consumer Lot Lending [Member] | Special Mention [Member]
    
Note 5 - Allowance for Loan Losses (Details) - Loans by Credit Quality Indicators [Line Items]    
Loans 87,000 105,000
Real Estate Construction [Member] | Consumer Lot Lending [Member] | Substandard [Member]
    
Note 5 - Allowance for Loan Losses (Details) - Loans by Credit Quality Indicators [Line Items]    
Loans   146,000
Real Estate Construction [Member] | Consumer Lot Lending [Member]
    
Note 5 - Allowance for Loan Losses (Details) - Loans by Credit Quality Indicators [Line Items]    
Loans 3,172,000 [1] 2,082,000 [2]
Commercial, Financial And Agricultural [Member] | Commercial Real Estate Lending [Member] | Pass [Member]
    
Note 5 - Allowance for Loan Losses (Details) - Loans by Credit Quality Indicators [Line Items]    
Loans 166,679,000 152,017,000
Commercial, Financial And Agricultural [Member] | Commercial Real Estate Lending [Member] | Special Mention [Member]
    
Note 5 - Allowance for Loan Losses (Details) - Loans by Credit Quality Indicators [Line Items]    
Loans 4,403,000 2,934,000
Commercial, Financial And Agricultural [Member] | Commercial Real Estate Lending [Member] | Substandard [Member]
    
Note 5 - Allowance for Loan Losses (Details) - Loans by Credit Quality Indicators [Line Items]    
Loans 13,434,000 11,685,000
Commercial, Financial And Agricultural [Member] | Commercial Real Estate Lending [Member] | Substandard Nonaccural [Member]
    
Note 5 - Allowance for Loan Losses (Details) - Loans by Credit Quality Indicators [Line Items]    
Loans 1,702,000 1,486,000
Commercial, Financial And Agricultural [Member] | Commercial Real Estate Lending [Member]
    
Note 5 - Allowance for Loan Losses (Details) - Loans by Credit Quality Indicators [Line Items]    
Loans 186,218,000 [1] 168,122,000 [2]
Commercial, Financial And Agricultural [Member] | Land Acquisition And Development Lending [Member] | Pass [Member]
    
Note 5 - Allowance for Loan Losses (Details) - Loans by Credit Quality Indicators [Line Items]    
Loans 28,608,000 18,236,000
Commercial, Financial And Agricultural [Member] | Land Acquisition And Development Lending [Member] | Special Mention [Member]
    
Note 5 - Allowance for Loan Losses (Details) - Loans by Credit Quality Indicators [Line Items]    
Loans 1,341,000 1,601,000
Commercial, Financial And Agricultural [Member] | Land Acquisition And Development Lending [Member] | Substandard [Member]
    
Note 5 - Allowance for Loan Losses (Details) - Loans by Credit Quality Indicators [Line Items]    
Loans 3,697,000 5,803,000
Commercial, Financial And Agricultural [Member] | Land Acquisition And Development Lending [Member]
    
Note 5 - Allowance for Loan Losses (Details) - Loans by Credit Quality Indicators [Line Items]    
Loans 33,646,000 [1] 25,640,000 [2]
Commercial, Financial And Agricultural [Member] | Builder Line Lending [Member] | Pass [Member]
    
Note 5 - Allowance for Loan Losses (Details) - Loans by Credit Quality Indicators [Line Items]    
Loans 16,390,000 11,608,000
Commercial, Financial And Agricultural [Member] | Builder Line Lending [Member] | Special Mention [Member]
    
Note 5 - Allowance for Loan Losses (Details) - Loans by Credit Quality Indicators [Line Items]    
Loans 1,174,000 1,278,000
Commercial, Financial And Agricultural [Member] | Builder Line Lending [Member] | Substandard [Member]
    
Note 5 - Allowance for Loan Losses (Details) - Loans by Credit Quality Indicators [Line Items]    
Loans 568,000 527,000
Commercial, Financial And Agricultural [Member] | Builder Line Lending [Member] | Substandard Nonaccural [Member]
    
Note 5 - Allowance for Loan Losses (Details) - Loans by Credit Quality Indicators [Line Items]    
Loans   13,000
Commercial, Financial And Agricultural [Member] | Builder Line Lending [Member]
    
Note 5 - Allowance for Loan Losses (Details) - Loans by Credit Quality Indicators [Line Items]    
Loans 18,132,000 [1] 13,426,000 [2]
Commercial, Financial And Agricultural [Member] | Commercial Business Lending [Member] | Pass [Member]
    
Note 5 - Allowance for Loan Losses (Details) - Loans by Credit Quality Indicators [Line Items]    
Loans 43,174,000 61,715,000
Commercial, Financial And Agricultural [Member] | Commercial Business Lending [Member] | Special Mention [Member]
    
Note 5 - Allowance for Loan Losses (Details) - Loans by Credit Quality Indicators [Line Items]    
Loans 1,231,000 2,758,000
Commercial, Financial And Agricultural [Member] | Commercial Business Lending [Member] | Substandard [Member]
    
Note 5 - Allowance for Loan Losses (Details) - Loans by Credit Quality Indicators [Line Items]    
Loans 12,771,000 16,558,000
Commercial, Financial And Agricultural [Member] | Commercial Business Lending [Member] | Substandard Nonaccural [Member]
    
Note 5 - Allowance for Loan Losses (Details) - Loans by Credit Quality Indicators [Line Items]    
Loans 374,000 374,000
Commercial, Financial And Agricultural [Member] | Commercial Business Lending [Member]
    
Note 5 - Allowance for Loan Losses (Details) - Loans by Credit Quality Indicators [Line Items]    
Loans 57,550,000 [1] 81,405,000 [2]
Equity Lines [Member] | Pass [Member]
    
Note 5 - Allowance for Loan Losses (Details) - Loans by Credit Quality Indicators [Line Items]    
Loans 48,644,000 48,603,000
Equity Lines [Member] | Special Mention [Member]
    
Note 5 - Allowance for Loan Losses (Details) - Loans by Credit Quality Indicators [Line Items]    
Loans 775,000 1,003,000
Equity Lines [Member] | Substandard [Member]
    
Note 5 - Allowance for Loan Losses (Details) - Loans by Credit Quality Indicators [Line Items]    
Loans 949,000 898,000
Equity Lines [Member] | Substandard Nonaccural [Member]
    
Note 5 - Allowance for Loan Losses (Details) - Loans by Credit Quality Indicators [Line Items]    
Loans 209,000 291,000
Equity Lines [Member]
    
Note 5 - Allowance for Loan Losses (Details) - Loans by Credit Quality Indicators [Line Items]    
Loans 50,577,000 [1] 50,795,000 [2]
Consumer [Member] | Pass [Member]
    
Note 5 - Allowance for Loan Losses (Details) - Loans by Credit Quality Indicators [Line Items]    
Loans 7,889,000 8,616,000
Consumer [Member] | Special Mention [Member]
    
Note 5 - Allowance for Loan Losses (Details) - Loans by Credit Quality Indicators [Line Items]    
Loans 2,000 2,000
Consumer [Member] | Substandard [Member]
    
Note 5 - Allowance for Loan Losses (Details) - Loans by Credit Quality Indicators [Line Items]    
Loans 116,000 158,000
Consumer [Member] | Substandard Nonaccural [Member]
    
Note 5 - Allowance for Loan Losses (Details) - Loans by Credit Quality Indicators [Line Items]    
Loans 232,000 231,000
Consumer [Member]
    
Note 5 - Allowance for Loan Losses (Details) - Loans by Credit Quality Indicators [Line Items]    
Loans 8,239,000 [1] 9,007,000 [2]
Pass [Member]
    
Note 5 - Allowance for Loan Losses (Details) - Loans by Credit Quality Indicators [Line Items]    
Loans 488,927,000 484,364,000
Special Mention [Member]
    
Note 5 - Allowance for Loan Losses (Details) - Loans by Credit Quality Indicators [Line Items]    
Loans 10,988,000 11,901,000
Substandard [Member]
    
Note 5 - Allowance for Loan Losses (Details) - Loans by Credit Quality Indicators [Line Items]    
Loans 37,871,000 42,004,000
Substandard Nonaccural [Member]
    
Note 5 - Allowance for Loan Losses (Details) - Loans by Credit Quality Indicators [Line Items]    
Loans $ 4,670,000 $ 4,391,000
[1] At June 30, 2014, the Corporation did not have any loans classified as Doubtful or Loss.
[2] At December 31, 2013, the Corporation did not have any loans classified as Doubtful or Loss.