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EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
EARNINGS PER SHARE
Net income (loss)	$ 12	$ (29)	$ (333)	$ (707)	$ (1,057)	$ (554)	$ (350)	$ (2,318)
Denominator for basic earnings (loss) per share: weighted average shares	8,621			8,394			8,519	8,305
Employee stock options and awards (in thousands)	139			69				57
Denominator for diluted earnings (loss) per share: adjusted weighted-average shares and assumed conversions of stock options	8,760			8,463			8,519	8,362
Basic earnings (loss) per share	$ 0.00			$ (0.09)			$ (0.04)	$ (0.28)
Diluted earnings (loss) per share	$ 0.00			$ (0.09)			$ (0.04)	$ (0.28)

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