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Earnings per Share - Basic and Diluted (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Numerator:    
Net income $ 225 $ 252
Denominator for basic net income per common share:    
Weighted average common shares outstanding (in shares) 12,920,000 12,804,000
Denominator for diluted net income per share:    
Weighted average common shares outstanding (in shares) 12,920,000 12,804,000
Dilutive effect of stock options and restricted stock (in shares) 249,000 252,000
Diluted weighted average shares (in shares) 13,169,000 13,056,000
Earnings per common share:    
Basic (in USD per share) $ 0.02 $ 0.02
Diluted (in USD per share) $ 0.02 $ 0.02
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 83,917
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 $ 28.15
Exercise price of shares not included in the computation of dilutive income per share, upper limit (in USD per share) $ 33.36 $ 33.36