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Note 4 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Dec. 31, 2011
Note 4 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans (Details) [Line Items]                
Loans and Leases Receivable, Allowance $ 7,952 $ 8,168 $ 7,952 $ 8,168 $ 8,291 $ 8,349 $ 8,063 $ 8,068
Nonaccrual Designation as Impaired Threshold     250          
Threshold period for considering loans as special mention or classified     75 days          
Financing Receivable, Modifications, Recorded Investment 7,756 5,798 7,756 5,798   4,246    
Financing Receivable, Allowance for Credit Losses, Write-downs (730) (1,028) (1,484) (1,728)        
Financing Receivable Modifications Impairment Accrued 10 197 10 244        
Portion Based on Historical Loss Rates [Member]
                
Note 4 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans (Details) [Line Items]                
Loans and Leases Receivable, Allowance 3,525   3,525          
Portion Based on Historical Loss Rates Under Former Methodology [Member]
                
Note 4 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans (Details) [Line Items]                
Loans and Leases Receivable, Allowance 2,695   2,695          
Portion Based on Historical Loss Rates Applied to Non-classified Loans [Member]
                
Note 4 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans (Details) [Line Items]                
Loans and Leases Receivable, Allowance 2,687   2,687          
Portion Based on Historical Loss Rates Applied to Classified Loans [Member]
                
Note 4 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans (Details) [Line Items]                
Loans and Leases Receivable, Allowance 838   838          
Consumer Real Estate [Member]
                
Note 4 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans (Details) [Line Items]                
Financing Receivable, Allowance for Credit Losses, Write-downs   $ 109            
Special Mention [Member]
                
Note 4 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans (Details) [Line Items]                
Increase in percentage of allocation     50.00%          
Classified Loans [Member]
                
Note 4 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans (Details) [Line Items]                
Increase in percentage of allocation     100.00%