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Common Stock and Earnings Per Share (Tables)
6 Months Ended
Jun. 30, 2019
Common Stock and Earnings Per Share [Abstract]  
Shares Used in Computing Basic and Diluted Earnings per Share
  
Three Months
Ended June 30
  
Six Months
Ended June 30
 
  
2019
  
2018
  
2019
  
2018
 
             
Weighted average common shares, basic
  
12,955,656
   
12,895,687
   
12,949,036
   
12,886,154
 
Effect of dilutive securities:
                
Employee stock-based compensation
  
510
   
62
   
355
   
52
 
Weighted average common shares, diluted
  
12,956,166
   
12,895,749
   
12,949,391
   
12,886,206