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Note 5 - Earnings Per Share (Tables)
9 Months Ended
Sep. 30, 2012
Schedule of Calculation of Numerator and Denominator in Earnings Per Share [Table Text Block]
   
Three Months Ended
September 30,
   
Nine Months Ended
September 30,
 
   
2012
   
2011
   
2012
   
2011
 
Numerator:
                       
Net income
  $ 280,770     $ 829,106     $ 3,394,514     $ 3,056,038  
Numerator for basic and diluted earnings per share
    280,770       829,106       3,394,514       3,056,038  
Denominator:
                               
Weighted-average shares outstanding-basic
    10,156,790       10,156,442       10,156,559       10,156,442  
                                 
Effect of dilutive securities:
                               
Stock options
    20,676       11,884       23,010       23,081  
Dilutive potential common shares
    20,676       11,884       23,010       23,081  
Denominator for diluted earnings per share-weighted-average shares
    10,177,466       10,168,326       10,179,569       10,179,523  
                                 
Basic earnings per share
  $ 0.03     $ 0.08     $ 0.33     $ 0.30  
Diluted earnings per share
  $ 0.03     $ 0.08     $ 0.33     $ 0.30