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4. Net Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Net Earnings    
Basic earnings per share $ 2,367 $ 3,667
Effect of dilutive securities: restricted stock units 0 0
Diluted earnings per share $ 2,367 $ 3,667
Weighted Average Number of Shares    
Basic earnings per share (in shares) 5,869,938 5,996,488
Effect of dilutive securities: restricted stock units (in shares) 13,440 24,369
Diluted earnings per share (in shares) 5,883,378 6,020,857
Per Share Amount    
Basic earnings per share $ .40 $ 0.61
Diluted earnings per share $ .40 $ 0.61