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Note 7 - Loans and Related Allowance for Loan and Lease Losses (Details) - Allowance for Loan Losses (USD $)
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Dec. 31, 2012
Ending allowance balance attributable to loans:        
Individually evaluated for impairment $ 1,382,000   $ 1,807,000  
Collectively evaluated for impairment 5,633,000   5,239,000  
Balance 7,015,000 7,732,000 7,046,000 7,779,000
Charge-offs (350,000) (470,000)    
Recoveries 139,000 110,000    
Provision 180,000 313,000    
Commercial and Industrial [Member]
        
Ending allowance balance attributable to loans:        
Individually evaluated for impairment 221,000   179,000  
Collectively evaluated for impairment 646,000   435,000  
Balance 867,000 1,230,000 614,000 1,732,000
Charge-offs (12,000) (325,000)    
Recoveries 1,000 1,000    
Provision 264,000 (178,000)    
Real Estate Construction [Member]
        
Ending allowance balance attributable to loans:        
Individually evaluated for impairment 153,000   210,000  
Collectively evaluated for impairment 335,000   366,000  
Balance 488,000 1,048,000 576,000 1,123,000
Charge-offs   (61,000)    
Recoveries   33,000    
Provision (88,000) (47,000)    
Residential Real Estate Mortgage [Member]
        
Ending allowance balance attributable to loans:        
Individually evaluated for impairment 798,000   855,000  
Collectively evaluated for impairment 2,928,000   2,809,000  
Balance 3,726,000 3,206,000 3,664,000 2,872,000
Charge-offs (315,000) (67,000)    
Recoveries 136,000 24,000    
Provision 241,000 377,000    
Commercial Real Estate Mortgage [Member]
        
Ending allowance balance attributable to loans:        
Individually evaluated for impairment 198,000   563,000  
Collectively evaluated for impairment 1,664,000   1,607,000  
Balance 1,862,000 2,201,000 2,170,000 1,991,000
Recoveries   46,000    
Provision (308,000) 164,000    
Consumer Installment [Member]
        
Ending allowance balance attributable to loans:        
Individually evaluated for impairment 12,000      
Collectively evaluated for impairment 60,000   22,000  
Balance 72,000 47,000 22,000 61,000
Charge-offs (23,000) (17,000)    
Recoveries 2,000 6,000    
Provision $ 71,000 $ (3,000)