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Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2021
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted

The basic and diluted earnings per share amounts were calculated as follows:

 

                 
   Three Months Ended September 30   Nine Months Ended September 30 
   2021   2020   2021   2020 
Numerator:                
Net earnings  $10,790,730   $29,304,769   $34,176,924   $51,286,265 
Denominator:                    
Basic weighted-average shares outstanding   20,160,912    19,830,879    20,117,257    19,717,877 
Effect of dilutive securities:                    
Employee stock options   819,969    587,720    810,438    424,206 
                     
Diluted weighted-average shares outstanding   20,980,881    20,418,599    20,927,695    20,142,083 
                     
Basic net earnings per share  $0.54   $1.48   $1.70   $2.60 
                     
Diluted net earnings per share  $0.51   $1.44   $1.63   $2.55 
Schedule of Activity of Stock Option Plans

The following table summarizes the activity in shares of capital stock for the periods presented:

 

   Class A   Class C 
Outstanding shares at December 31, 2019   16,107,779    2,500,887 
           
Exercise of stock options   33,774    — 
Stock dividends   405,210    61,720 
Conversion of Class C to Class A   13,224    (13,224)
           
Outstanding shares at September 30, 2020   16,559,987    2,549,383 
           
Outstanding shares at December 31, 2020   16,595,783    2,679,603 
           
Exercise of stock options   111,608    — 
Stock dividends   837,410    131,553 
Conversion of Class C to Class A   49,247    (49,247)
           
Outstanding shares at September 30, 2021   17,594,048    2,761,909