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Common Stock and Earnings Per Share (Tables)
3 Months Ended
Mar. 31, 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 March 31
 
  
2021
  
2020
 
       
Weighted average common shares, basic
  
13,055,871
   
13,009,596
 
Effect of dilutive securities:
        
Employee stock-based compensation
  
2,690
   
2,263
 
Weighted average common shares, diluted
  
13,058,561
   
13,011,859