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Net Earnings Per Common Share
 12 Months Ended
Dec. 31, 2022
Earnings per share [abstract]  
Net Earnings Per Common Share Net Earnings Per Common Share
 
 
2022

2021

2020
Weighted average common shares outstanding
– basic (thousands of shares)
1,134,960 

1,181,250 

1,181,768 
Effect of dilutive stock options (thousands of shares)
14,222 

5,307 

— 
Weighted average common shares outstanding
– diluted (thousands of shares)
1,149,182 1,186,557 1,181,768 
Net earnings (loss)
$10,937 

$7,664 

$(435)
Net earnings (loss) per common share
– basic
$9.64 

$6.49 

$(0.37)
 
– diluted
$9.52 

$6.46 

$(0.37)
In 2022, the Company excluded 2,039,000 potentially anti-dilutive stock options from the calculation of diluted earnings per common share (2021 – 3,496,000; 2020 – 44,117,000).