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4. Net Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Net Earnings        
Basic earnings per share $ 2,561 $ 3,813 $ 4,928 $ 7,480
Effect of dilutive securities: restricted stock units 0 0 0 0
Diluted earnings per share $ 2,561 $ 3,813 $ 4,928 $ 7,480
Weighted Average Number of Shares        
Basic earnings per share (in shares) 5,787,504 5,940,556 5,828,965 5,968,368
Effect of dilutive securities: restricted stock units (in shares) 13,127 24,453 13,284 24,412
Diluted earnings per share (in shares) 5,800,631 5,965,009 5,842,249 5,992,780
Per Share Amount        
Basic earnings per share $ 0.44 $ 0.64 $ 0.84 $ 1.25
Diluted earnings per share $ 0.44 $ 0.64 $ 0.84 $ 1.25