INCOME TAXES - Income Tax Expense (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
INCOME TAXES
U.S. federal income tax rate (as a percent)	21.00%	34.00%	34.00%
U.S. federal income tax rate #2 (as a percent)		35.00%
Tax rate change adjustment related to Tax Reform Act		$ 115,000
Current:
Federal		(5,000)	$ (72,000)
State		9,000	7,000
Total current		4,000	(65,000)
Deferred - Federal		(302,000)	61,000
Income tax expense		$ (298,000)	$ (4,000)