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Computation of Earnings per Share (Tables)
9 Months Ended
Sep. 30, 2017
Earnings Per Share [Abstract]  
Schedule of net income per share
   

Three Months Ended

September 30,

   

Nine Months Ended

September 30,

 
    2017     2016     2017     2016  
                         
Net income   $ 1,229     $ 1,573     $ 1,863     $ 3,643  
                                 
Shares outstanding:                                
Weighted-average common shares outstanding     21,679       22,847       21,900       22,934  
Additional dilutive common stock equivalents     79       92       67       62  
Diluted shares outstanding     21,758       22,939       21,967       22,996  
                                 
Net income per share – basic   $ 0.06     $ 0.07     $ 0.09     $ 0.16  
Net income per share - diluted   $ 0.06     $ 0.07     $ 0.08     $ 0.16