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PER SHARE DATA (Tables)
 12 Months Ended
Dec. 31, 2017
Earnings Per Share [Abstract]  
Schedule of Weighted Average Common Shares (Denominator) Used in the Basic and Dilutive Earnings Per Share Computation
The following table sets forth the composition of the weighted average common shares (denominator) used in the basic and dilutive per share computation.
 
 
Year Ended December 31,
 
 
2017
 
2016
 
2015
Weighted average common shares issued
 
5,008,073

 
5,005,971

 
5,003,691

Average treasury stock shares
 
(302,471
)
 
(270,514
)
 
(231,452
)
Weighted average common shares used to calculate basic and diluted earnings per share
 
4,705,602

 
4,735,457

 
4,772,239