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Note 4 - Loans and Related Allowance for Loan Losses (Details) - Allowance for Loan Losses (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Ending allowance balance attributable to loans:                        
Individually evaluated for impairment $ 1,807,000       $ 3,688,000       $ 1,807,000 $ 3,688,000    
Collectively evaluated for impairment 5,239,000       4,091,000       5,239,000 4,091,000    
Balance 7,046,000       7,779,000       7,046,000 7,779,000 6,819,000 6,221,000
Charge-offs                 (1,330,000) (1,337,000) (2,712,000)  
Recoveries                 401,000 129,000 225,000  
Provision (570,000) 153,000 300,000 313,000 975,000 143,000 450,000 600,000 196,000 2,168,000 3,085,000  
Commercial and Industrial [Member]
                        
Ending allowance balance attributable to loans:                        
Individually evaluated for impairment 179,000       1,189,000       179,000 1,189,000    
Collectively evaluated for impairment 435,000       543,000       435,000 543,000    
Balance 614,000       1,732,000       614,000 1,732,000 1,296,000 1,234,000
Charge-offs                 (419,000) (230,000) (568,000)  
Recoveries                 191,000 71,000 76,000  
Provision                 (890,000) 595,000 554,000  
Real Estate Construction [Member]
                        
Ending allowance balance attributable to loans:                        
Individually evaluated for impairment 210,000       933,000       210,000 933,000    
Collectively evaluated for impairment 366,000       190,000       366,000 190,000    
Balance 576,000       1,123,000       576,000 1,123,000 438,000 356,000
Charge-offs                 (191,000) (135,000) (6,000)  
Recoveries                 33,000      
Provision                 (389,000) 820,000 88,000  
Residential Real Estate Mortgage [Member]
                        
Ending allowance balance attributable to loans:                        
Individually evaluated for impairment 855,000       600,000       855,000 600,000    
Collectively evaluated for impairment 2,809,000       2,272,000       2,809,000 2,272,000    
Balance 3,664,000       2,872,000       3,664,000 2,872,000 3,731,000 3,392,000
Charge-offs                 (675,000) (785,000) (1,862,000)  
Recoveries                 107,000 31,000 122,000  
Provision                 1,360,000 (105,000) 2,079,000  
Commercial Real Estate Mortgage [Member]
                        
Ending allowance balance attributable to loans:                        
Individually evaluated for impairment 563,000       960,000       563,000 960,000    
Collectively evaluated for impairment 1,607,000       1,031,000       1,607,000 1,031,000    
Balance 2,170,000       1,991,000       2,170,000 1,991,000 1,306,000 1,143,000
Charge-offs                   (123,000) (265,000)  
Recoveries                 46,000      
Provision                 133,000 808,000 428,000  
Consumer Installment [Member]
                        
Ending allowance balance attributable to loans:                        
Individually evaluated for impairment         6,000         6,000    
Collectively evaluated for impairment 22,000       55,000       22,000 55,000    
Balance 22,000       61,000       22,000 61,000 48,000 96,000
Charge-offs                 (45,000) (64,000) (11,000)  
Recoveries                 24,000 27,000 27,000  
Provision                 $ (18,000) $ 50,000 $ (64,000)