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Net Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Net Earnings        
Basic earnings per share $ 3,390,000 $ 4,509,000 $ 12,126,000 $ 9,437,000
Effect of dilutive securities: restricted stock units 0 0 0 0
Effect of dilutive securities: shares held in deferred comp plan 0 0 0 0
Diluted earnings per share $ 3,390,000 $ 4,509,000 $ 12,126,000 $ 9,437,000
Weighted Average Number of Shares        
Basic earnings per share (in shares) 5,544,596 5,634,964 5,601,879 5,665,294
Effect of dilutive securities: restricted stock units (in shares) 14,690 15,299 13,190 13,960
Effect of dilutive securities: shares held in deferred comp plan 159,797 151,658 158,039 149,163
Diluted earnings per share (in shares) 5,719,083 5,801,921 5,773,108 5,828,417
Per Share Amount        
Basic earnings per share $ 0.61 $ 0.80 $ 2.16 $ 1.67
Diluted earnings per share $ 0.59 $ 0.78 $ 2.10 $ 1.62