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EARNINGS PER SHARE (Tables)
 6 Months Ended
Jun. 30, 2018
EARNINGS PER SHARE [Abstract]  
Earnings and Weighted Average Shares outstanding Used in the Computation of Basic and Diluted Earnings Per Share
The following table sets forth the calculation of basic and diluted net earnings per common share under the two-class method for the three and six months ended June 30, 2018 and 2017:

  
 
Three Months Ended
  
Six Months Ended
 
 
 
June 30,
  
June 30,
 
 
 
2018
  
2017
  
2018
  
2017
 
 
            
Numerator:
            
Net earnings
 
$
6,634
  
$
3,120
  
$
5,332
  
$
3,866
 
Less dividends declared:
                
     Class A
  
130
   
131
   
261
   
261
 
     Class B
  
689
   
689
   
1,389
   
1,388
 
Undistributed earnings
 
$
5,815
  
$
2,300
  
$
3,682
  
$
2,217
 
 
                
Undistributed earnings allocation - basic and diluted:
                
     Class A undistributed earnings
 
$
1,011
  
$
399
  
$
640
  
$
385
 
     Class B undistributed earnings
  
4,804
   
1,901
   
3,042
   
1,832
 
     Total undistributed earnings
 
$
5,815
  
$
2,300
  
$
3,682
  
$
2,217
 
 
                
Net earnings allocation - basic and diluted:
                
     Class A net earnings
 
$
1,141
  
$
530
  
$
901
  
$
646
 
     Class B net earnings
  
5,493
   
2,590
   
4,431
   
3,220
 
     Net earnings
 
$
6,634
  
$
3,120
  
$
5,332
  
$
3,866
 
 
                
Denominator:
                
Weighted-average shares outstanding:
                
     Class A - basic and diluted
  
2,175
   
2,175
   
2,175
   
2,175
 
     Class B - basic and diluted
  
9,844
   
9,859
   
9,850
   
9,852
 
 
                
Net earnings per share:
                
     Class A - basic and diluted
 
$
0.52
  
$
0.24
  
$
0.41
  
$
0.30
 
     Class B - basic and diluted
 
$
0.56
  
$
0.26
  
$
0.45
  
$
0.33