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Net Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2022
Jun. 30, 2021
Net Earnings            
Basic Earnings Per Share   $ 3,217,000   $ 4,615,000 $ 6,669,000 $ 8,736,000
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   $ 3,217,000   $ 4,615,000 $ 6,669,000 $ 8,736,000
Weighted Average Number Of Shares            
Basic Earnings Per Share (in Shares)   5,481,899   5,630,580 5,489,461 5,630,995
Effect Of Dilutive Securities: Restricted Stock Units (in Shares)   14,879   12,683 14,024 12,427
Effect Of Dilutive Securities: Shares Held In Deferred Comp Plan   164,934   157,897 164,089 157,227
Diluted Earnings Per Share (in Shares)   5,661,712   5,801,160 5,667,574 5,800,649
Per Share Amount            
Basic Earnings Per Share $ 0.59 $ 0.59 $ 0.82 $ 0.82 $ 1.21 $ 1.55
Diluted Earnings Per Share $ 0.57 $ 0.57 $ 0.80 $ 0.80 $ 1.18 $ 1.51