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Note 4 - Earnings Per Share (Tables)
9 Months Ended
Sep. 30, 2014
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
     

Three Months Ended

   

Nine Months Ended

 
     

September 30,

   

September 30,

 
     

2014

   

2013

   

2014

   

2013

 

Numerator:

                               
 

Net income

  $ 1,628,562     $ 1,561,832     $ 5,248,459     $ 4,777,506  
 

Numerator for basic and diluted earnings per share

    1,628,562       1,561,832       5,248,459       4,777,506  

Denominator:

                               
 

Weighted-average shares outstanding-basic

    10,203,711       10,176,744       10,200,411       10,163,490  
                                   

Effect of dilutive securities:

                               
 

Stock options

    36,294       44,768       38,133       41,858  
 

Restricted stock

    1,405       -       1,565          

Dilutive potential common shares

    37,699       44,768       39,698       41,858  
 

Denominator for diluted earnings per share-weighted-average shares

    10,241,410       10,221,512       10,240,109       10,205,348  
                                   
 

Basic earnings per share

  $ 0.16     $ 0.15     $ 0.51     $ 0.47  
 

Diluted earnings per share

  $ 0.16     $ 0.15     $ 0.51     $ 0.47