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SELECTED QUARTERLY DATA (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2017
SELECTED QUARTERLY DATA (Unaudited) [Abstract]  
Schedule of Quarterly Financial Information
The results of operations for any quarter are not necessarily indicative of the results of operations for any future period.

  
First
Quarter
  
Second
Quarter
  
Third
Quarter
  
Fourth
Quarter
 
Year ended December 31, 2017
            
Net revenues
 
$
7,690,619
  
$
6,535,516
  
$
6,516,108
  
$
6,701,509
 
Operating profit
  
5,010,121
   
3,882,502
   
3,983,760
   
4,801,768
 
Net income
  
3,344,753
   
2,624,091
   
2,714,832
   
2,644,590
 
Basic earnings per share
 
$
0.47
  
$
0.37
  
$
0.38
  
$
0.37
 
Diluted earnings per share
 
$
0.46
  
$
0.36
  
$
0.37
  
$
0.36
 

  
First
Quarter
  
Second
Quarter
  
Third
Quarter
  
Fourth
Quarter
 
Year ended December 31, 2016
            
Net revenues
 
$
6,567,991
  
$
6,180,156
  
$
6,882,160
  
$
6,620,648
 
Operating profit
  
4,155,158
   
3,833,596
   
4,725,885
   
4,311,777
 
Net income
  
2,829,124
   
2,572,715
   
3,053,593
   
2,916,807
 
Basic earnings per share
 
$
0.40
  
$
0.37
  
$
0.43
  
$
0.41
 
Diluted earnings per share
 
$
0.39
  
$
0.35
  
$
0.42
  
$
0.40