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Net Income Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Numerator:                      
Income from continuing operations $ 1,564 $ 118 $ 477 $ 2,502 $ 675 $ (576) $ 633 $ 860 $ 4,661 $ 1,592 $ 6,007
Income from discontinued operations, net of income taxes 0 0 0 0 0 0 54 1,884 0 1,938 624
Net income $ 1,564 $ 118 $ 477 $ 2,502 $ 675 $ (576) $ 687 $ 2,744 $ 4,661 $ 3,530 $ 6,631
Denominator:                      
Weighted average common shares (in shares)                 12,323,000 12,882,000 13,997,000
Effect of dilutive securities: stock options (in shares)                 187,000 12,000 0
Diluted weighted average common shares (in shares)                 12,510,000 12,894,000 13,997,000
Income per share—basic:                      
Continuing operations (in dollars per share) $ 0.13 $ 0.01 $ 0.04 $ 0.20 $ 0.05 $ (0.05) $ 0.05 $ 0.07 $ 0.38 $ 0.12 $ 0.43
Discontinued operation (in dollars per share) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.00 0.15 0.04
Net income per share, basic (in dollars per share) 0.13 0.01 0.04 0.20 0.05 (0.05) 0.05 0.21 0.38 0.27 0.47
Income per share—diluted:                      
Continuing operations (in dollars per share) 0.13 0.01 0.04 0.20 0.05 (0.05) 0.05 0.07 0.37 0.12 0.43
Discontinued operation (in dollars per share) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.00 0.15 0.04
Net income per share, diluted (in dollars per share) $ 0.13 $ 0.01 $ 0.04 $ 0.20 $ 0.05 $ (0.05) $ 0.05 $ 0.21 $ 0.37 $ 0.27 $ 0.47
Antidilutive securities excluded from computation of earnings per share (in shares)                 200,000 550,000 600,000