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NET INCOME PER SHARE - Calculation of net income per share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Earnings Per Share [Abstract]                      
Net income $ 460 $ 1,573 $ 1,436 $ 635 $ 1,826 $ 2,197 $ 319 $ 272 $ 4,103 $ 4,614 $ 4,583
Shares outstanding:                      
Weighted-average common shares outstanding (in shares)                 22,829 22,899 22,703
Additional dilutive common stock equivalents (in shares)                 69 66 84
Diluted shares outstanding (in shares)                 22,898 22,965 22,787
Net income per share - basic (in dollars per share) $ 0.02 $ 0.07 $ 0.06 $ 0.03 $ 0.08 $ 0.10 $ 0.01 $ 0.01 $ 0.18 $ 0.20 $ 0.20
Net income per share - diluted (in dollars per share) $ 0.02 $ 0.07 $ 0.06 $ 0.03 $ 0.08 $ 0.10 $ 0.01 $ 0.01 $ 0.18 $ 0.20 $ 0.20