INCOME TAXES (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Composition of provision for income taxes
Federal and state income tax expense for Distributor	$ 231	$ 378	$ 188
Texas margin tax	288	197	198
Canadian income tax	(15)	63	0
Total provision for income taxes	$ 504	$ 638	$ 386
Effective income tax rate (as a percent)	36.00%
Effective margin tax rate (as a percent)	0.95%