(LOSS) INCOME PER SHARE - Loss per share basic and diluted (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Numerator for basic and diluted loss per common share
Net (loss) income	$ (857,000)	$ 136,000	$ (3,996,000)	$ 5,798,000
Denominator:
Denominator for basic earnings per share - weighted average common shares outstanding	3,151,000	3,144,000	3,148,000	3,229,000
Dilutive securities		49,000		60,000
Denominator for diluted earnings per share - weighted average common shares outstanding	3,151,000	3,193,000	3,148,000	3,289,000