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4. Net Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Net Earnings        
Basic earnings per share $ 3,621 $ 3,467 $ 11,101 $ 9,946
Effect of dilutive securities: restricted stock units 0 0 0 0
Diluted earnings per share $ 3,621 $ 3,467 $ 11,101 $ 9,946
Weighted Average Number of Shares        
Basic earnings per share (in shares) 5,919,322 5,995,256 5,951,840 5,995,256
Effect of dilutive securities: restricted stock units (in shares) 25,883 21,445 24,908 19,137
Diluted earnings per share (in shares) 5,945,205 6,016,701 5,976,748 6,014,393
Per Share Amount        
Basic earnings per share $ 0.62 $ 0.58 $ 1.87 $ 1.66
Diluted earnings per share $ 0.61 $ 0.57 $ 1.86 $ 1.65