LOSS PER SHARE - Loss per share basic and diluted (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Numerator for basic and diluted loss per common share:
Net loss	$ (307,000)	$ (758,000)
Denominator:
Denominator for diluted earnings per share - weighted average common shares outstanding	3,169,000	3,144,000