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Earnings per Share - Basic and Diluted (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Numerator:        
Net income $ 522 $ 1,509 $ 1,149 $ 5,309
Denominator for basic net income per common share:        
Weighted average common shares outstanding (in shares) 12,838,000 12,717,000 12,825,000 12,691,000
Denominator for diluted net income per share:        
Weighted average common shares outstanding (in shares) 12,838,000 12,717,000 12,825,000 12,691,000
Dilutive effect of stock options and restricted stock (in shares) 279,000 245,000 277,000 222,000
Diluted weighted average shares (in shares) 13,117,000 12,962,000 13,102,000 12,913,000
Earnings per common share:        
Basic (in USD per share) $ 0.04 $ 0.12 $ 0.09 $ 0.42
Diluted (in USD per share) $ 0.04 $ 0.12 $ 0.09 $ 0.41
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Number of shares not included in the computation of dilutive income per share (in shares) 83,917 52,500 83,917 105,833
Antidilutive Effect        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Exercise price of shares not included in the computation of dilutive income per share, lower limit (in USD per share) $ 28.15 $ 30.41 $ 28.15 $ 22.90
Exercise price of shares not included in the computation of dilutive income per share, upper limit (in USD per share) $ 33.36 $ 33.36 $ 33.36 $ 33.36