EARNINGS PER SHARE - Earning per share basic and diluted (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Numerator for basic and diluted earnings (loss) per common share:
Net income	$ 5,688,000	$ 305,000	$ 5,662,000	$ 370,000
Denominator:
Denominator for basic earnings per share - weighted average common shares outstanding	3,163,000	3,592,000	3,271,000	3,588,000
Dilutive securities	67,000	90,000	66,000	126,000
Denominator for diluted earnings per share - weighted average common shares outstanding	3,230,000	3,682,000	3,337,000	3,714,000