(LOSS) INCOME PER SHARE - (Loss) income per share basic and diluted (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Numerator for basic and diluted (loss) income per common share:
Net (loss) income	$ (733,000)	$ (857,000)	$ 1,383,000	$ (3,996,000)
Denominator:
Denominator for basic (loss) earnings per share - weighted average common shares outstanding	3,181,000	3,151,000	3,177,000	3,148,000
Dilutive securities			14,000
Denominator for diluted (loss) income per share - weighted average common shares outstanding	3,181,000	3,151,000	3,191,000	3,148,000