EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
EARNINGS PER SHARE
Net income (loss)	$ (29)	$ (333)	$ (1,057)	$ (554)	$ (362)	$ (1,611)
Denominator for basic earnings (loss) per share: weighted average shares	8,517		8,302		8,469	8,261
Employee stock options and awards (in thousands)	0		0		0	0
Denominator for diluted earnings (loss) per share: adjusted weighted-average shares and assumed conversions of stock options	8,517		8,302		8,469	8,261
Total basic earnings (loss) per share	$ 0.00		$ (0.13)		$ (0.04)	$ (0.19)
Total diluted earnings (loss) per share	$ 0.00		$ (0.13)		$ (0.04)	$ (0.19)