EARNINGS (LOSS) PER SHARE - Computation of Basic and Diluted Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
EARNINGS (LOSS) PER SHARE
Net (loss) income	$ 2,295	$ (931)	$ (2,551)	$ (1,373)	$ 1	$ 1,501	$ (1,187)	$ 129
Denominator:
Denominator for basic earnings (loss) per share - weighted average shares (in shares)	8,807			8,564			8,762	8,509
Effect of dilutive securities:
Employee restricted stock and incentive stock options (in shares)	148							13
Denominator for diluted earnings (loss) per share - adjusted weighted average shares and assumed conversion (in shares)	8,955			8,564			8,762	8,522
Basic (loss) earnings per share (in dollars per share)	$ 0.26			$ (0.16)			$ (0.14)	$ 0.02
Diluted (loss) earnings per share (in dollars per share)	$ 0.26			$ (0.16)			$ (0.14)	$ 0.02
Weighted average anti-dilutive employee restricted stock and incentive stock options (in shares)	208			509			354	421