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Note 7 - Loans and Related Allowance for Loan and Lease Losses (Details) - Allowance for Loan Losses (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2013
Dec. 31, 2012
Ending allowance balance attributable to loans:                
Individually evaluated for impairment $ 1,759,000   $ 1,759,000     $ 1,807,000    
Collectively evaluated for impairment 5,529,000   5,529,000     5,239,000    
Balance 7,288,000 7,821,000 7,288,000 7,821,000 7,129,000 7,046,000 7,749,000 7,779,000
Charge-offs (32,000) (92,000) (616,000) (988,000)        
Recoveries 121,000 11,000 488,000 264,000        
Provision 70,000 153,000 370,000 766,000        
Commercial and Industrial [Member]
                
Ending allowance balance attributable to loans:                
Individually evaluated for impairment 79,000   79,000     179,000    
Collectively evaluated for impairment 607,000   607,000     435,000    
Balance 686,000 788,000 686,000 788,000 596,000 614,000 875,000 1,732,000
Charge-offs (3,000)   (95,000) (325,000)        
Recoveries 23,000   88,000 92,000        
Provision 70,000 (87,000) 79,000 (711,000)        
Real Estate Construction [Member]
                
Ending allowance balance attributable to loans:                
Individually evaluated for impairment 600,000   600,000     210,000    
Collectively evaluated for impairment 243,000   243,000     366,000    
Balance 843,000 1,299,000 843,000 1,299,000 423,000 576,000 1,191,000 1,123,000
Charge-offs       (190,000)        
Recoveries     60,000 33,000        
Provision 420,000 108,000 207,000 333,000        
Residential Real Estate Mortgage [Member]
                
Ending allowance balance attributable to loans:                
Individually evaluated for impairment 907,000   907,000     855,000    
Collectively evaluated for impairment 3,043,000   3,043,000     2,809,000    
Balance 3,950,000 3,639,000 3,950,000 3,639,000 4,130,000 3,664,000 3,626,000 2,872,000
Charge-offs (24,000) (87,000) (481,000) (432,000)        
Recoveries 94,000 2,000 289,000 73,000        
Provision (250,000) 98,000 478,000 1,126,000        
Commercial Real Estate Mortgage [Member]
                
Ending allowance balance attributable to loans:                
Individually evaluated for impairment 170,000   170,000     563,000    
Collectively evaluated for impairment 1,584,000   1,584,000     1,607,000    
Balance 1,754,000 2,073,000 1,754,000 2,073,000 1,925,000 2,170,000 2,005,000 1,991,000
Recoveries     40,000 46,000        
Provision (171,000) 68,000 (456,000) 36,000        
Consumer Installment [Member]
                
Ending allowance balance attributable to loans:                
Individually evaluated for impairment 3,000   3,000          
Collectively evaluated for impairment 52,000   52,000     22,000    
Balance 55,000 22,000 55,000 22,000 55,000 22,000 52,000 61,000
Charge-offs (5,000) (5,000) (40,000) (41,000)        
Recoveries 4,000 9,000 11,000 20,000        
Provision $ 1,000 $ (34,000) $ 62,000 $ (18,000)