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Earnings Per Share
12 Months Ended
Dec. 31, 2017
Earnings Per Share [Abstract]  
Earnings Per Share
(14) Earnings Per Share

Net income per share calculation information is as follows:

 

     Year ended December 31,  
     2016      2017  

Net income

   $ 47,488,413      $ 87,131,169  
  

 

 

    

 

 

 

Weighted-average shares outstanding:

     

Basic

     23,787,485        27,696,790  

Effect of dilutive restricted stock

     131,820        95,912  

Effect of dilutive contingently issuable shares

     31,653        —    
  

 

 

    

 

 

 

Diluted

     23,950,958        27,792,702  
  

 

 

    

 

 

 

Net income per Class A and Class B common share - basic

   $ 2.00      $ 3.15  
  

 

 

    

 

 

 

Net income per Class A and Class B common share - diluted

   $ 1.98      $ 3.14