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Note 7 - Loans and Related Allowance for Loan and Lease Losses (Details) - Additional Information on Impaired Loans (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Commercial and Industrial [Member]
        
Note 7 - Loans and Related Allowance for Loan and Lease Losses (Details) - Additional Information on Impaired Loans [Line Items]        
Impaired Financing Receivable - Average Recorded Investment $ 1,842 $ 2,643 $ 2,107 $ 2,687
Impaired Financing Receivable - Interest Income Recognized 22 15 71 70
Real Estate Construction [Member]
        
Note 7 - Loans and Related Allowance for Loan and Lease Losses (Details) - Additional Information on Impaired Loans [Line Items]        
Impaired Financing Receivable - Average Recorded Investment 3,556 3,850 3,644 3,499
Impaired Financing Receivable - Interest Income Recognized 38 58 119 95
Residential Real Estate Mortgage [Member]
        
Note 7 - Loans and Related Allowance for Loan and Lease Losses (Details) - Additional Information on Impaired Loans [Line Items]        
Impaired Financing Receivable - Average Recorded Investment 5,328 5,274 5,319 4,937
Impaired Financing Receivable - Interest Income Recognized 62 69 164 143
Commercial Real Estate Mortgage [Member]
        
Note 7 - Loans and Related Allowance for Loan and Lease Losses (Details) - Additional Information on Impaired Loans [Line Items]        
Impaired Financing Receivable - Average Recorded Investment 5,192 6,669 5,678 6,018
Impaired Financing Receivable - Interest Income Recognized 83 106 241 216
Consumer Installment [Member]
        
Note 7 - Loans and Related Allowance for Loan and Lease Losses (Details) - Additional Information on Impaired Loans [Line Items]        
Impaired Financing Receivable - Average Recorded Investment 11 14 12 18
Impaired Financing Receivable - Interest Income Recognized   $ 1   $ 1