DISTRIBUTIONS TO MEMBERS (Details) - USD ($)			6 Months Ended
	Jun. 27, 2018	Feb. 21, 2018	Jun. 30, 2018	Jun. 30, 2017
DISTRIBUTIONS TO MEMBERS
Member distributions paid	$ 2,168,667	$ 2,493,967	$ 4,663,000	$ 4,384,000
Distribution to members per outstanding membership unit (in dollars per unit)	$ 0.140	$ 0.161