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Net Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Net Earnings        
Basic earnings per share $ 4,615,000 $ 2,561,000 $ 8,736,000 $ 4,928,000
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 $ 4,615,000 $ 2,561,000 $ 8,736,000 $ 4,928,000
Weighted Average Number of Shares        
Basic earnings per share (in shares) 5,630,580 5,637,711 5,630,995 5,680,625
Effect of dilutive securities: restricted stock units (in shares) 12,683 13,127 12,427 13,284
Effect of dilutive securities: shares held in deferred comp plan 157,897 149,013 157,227 147,814
Diluted earnings per share (in shares) 5,801,160 5,799,851 5,800,649 5,841,723
Per Share Amount        
Basic earnings per share $ 0.82 $ 0.46 $ 1.55 $ 0.87
Diluted earnings per share $ 0.80 $ 0.44 $ 1.51 $ 0.84