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Earnings Per Share (Tables)
12 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
Schedule of Net Income Per Share
Net income per share calculation information is as follows:

 
 
 
Year ended December 31,
 
 
 
2017
 
 
2018
 
Net income
 
$
87,131,169
 
 
$
6,481,049
 
Weighted-average shares outstanding:
 
 
 
 
 
 
 
 
Basic
 
 
27,696,790
 
 
 
27,444,110
 
Effect of dilutive restricted stock
 
 
95,912
 
 
 
89,873
 
Diluted
 
 
27,792,702
 
 
 
27,533,983
 
Net income per Class A and Class B common share - basic
 
$
3.15
 
 
$
0.24
 
Net income per Class A and Class B common share - diluted
 
$
3.14
 
 
$
0.24