EARNINGS PER SHARE - Earning per share basic and diluted (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Numerator for basic and diluted earnings (loss) per common share:
Net income	$ 136,000	$ 541,000	$ 5,798,000	$ 911,000
Denominator:
Denominator for basic earnings per share - weighted average common shares outstanding	3,144,000	3,701,000	3,229,000	3,626,000
Dilutive securities	49,000	83,000	60,000	112,000
Denominator for diluted earnings per share - weighted average common shares outstanding	3,193,000	3,784,000	3,289,000	3,738,000