INCOME TAXES - Additional Information (Details) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income taxes
Effect of federal tax law change	$ 600,000	$ 606,000	$ 0	$ 0
Unrecognized tax benefits	0	0
State
Income taxes
Operating loss carryforwards	1,800,000	1,800,000
U.S. Federal
Income taxes
Operating loss carryforwards	400,000	400,000
U.S. Federal | Minimum tax credit carryforwards
Income taxes
Tax credit amount	$ 300,000	$ 300,000