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8. Income per Share (Tables)
6 Months Ended
Jun. 30, 2017
Income Per Share Tables  
Computation of basic and diluted income per share
   Three Months Ended  Six Months Ended
   June 30, 2017  June 30, 2016  June 30, 2017  June 30, 2016
Numerator:            
Net income (numerator for basic and diluted earnings per share)  $1,318   $1,365   $50   $1,878 
Denominator:                    
Denominator for basic earnings per share weighted average shares   13,785,046    13,734,286    13,759,732    13,732,424 
                     
Effect of dilutive securities:                    
       Options and RSUs   29,644    106,922    142,855    87,276 
                     
Denominator:                    
Denominator for diluted earnings per share weighted average shares   13,814,690    13,841,208    13,902,587    13,819,700 
                     
                     
Basic income per share  $0.10   $0.10   $0.00   $0.14 
Diluted income per share  $0.10   $0.10   $0.00   $0.14