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4. Net Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Net Earnings    
Basic earnings per share $ 4,121 $ 2,367
Effect of dilutive securities: restricted stock units 0 0
Effect of dilutive securities: shares held in deferred comp plan 0 0
Diluted earnings per share $ 4,121 $ 2,367
Weighted Average Number of Shares    
Basic earnings per share (in shares) 5,631,414 5,723,540
Effect of dilutive securities: restricted stock units (in shares) 12,169 13,440
Effect of dilutive securities: shares held in deferred comp plan 156,662 146,938
Diluted earnings per share (in shares) 5,800,245 5,883,378
Per Share Amount    
Basic earnings per share $ .73 $ .41
Diluted earnings per share $ 0.71 $ 0.4