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Common Stock and Earnings Per Share (Tables)
6 Months Ended
Jun. 30, 2021
Common Stock and Earnings Per Share [Abstract]  
Shares Used in Computing Basic and Diluted Earnings per Share
The following table summarizes the shares used in computing basic and diluted earnings per share:

 
Three Months
Ended June 30
   
Six Months
Ended June 30
 
   
2021
   
2020
   
2021
   
2020
 
                         
Weighted average common shares, basic
   
13,068,806
     
13,022,088
     
13,062,374
     
13,015,842
 
Effect of dilutive securities:
                               
Employee stock-based compensation
   
1,435
     
882
     
1,088
     
579
 
Weighted average common shares, diluted
   
13,070,241
     
13,022,970
     
13,063,462
     
13,016,421