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4. Net Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Net Earnings        
Basic earnings per share $ 3,813 $ 3,176 $ 7,480 $ 6,479
Effect of dilutive securities: restricted stock units 0 0 0 0
Diluted earnings per share $ 3,813 $ 3,176 $ 7,480 $ 6,479
Weighted Average Number of Shares        
Basic earnings per share (in shares) 5,940,556 5,995,256 5,968,368 5,995,256
Effect of dilutive securities: restricted stock units (in shares) 24,453 18,917 24,412 17,964
Diluted earnings per share (in shares) 5,965,009 6,014,173 5,992,780 6,013,220
Per Share Amount        
Basic earnings per share $ 0.64 $ 0.53 $ 1.25 $ 1.08
Diluted earnings per share $ 0.64 $ 0.53 $ 1.25 $ 1.08