SEGMENT REPORTING (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting Information [Line Items]
Revenues	$ 46,917,770	$ 36,912,779	$ 88,285,965	$ 71,683,393
Income (loss) from operations	3,023,845	(1,558,177)	2,007,348	(4,319,014)
Black Oil
Segment Reporting Information [Line Items]
Revenues	38,469,131	27,384,402	70,706,377	52,188,485
Refining & Marketing
Segment Reporting Information [Line Items]
Revenues	4,392,870	5,186,358	10,068,111	10,580,399
Recovery
Segment Reporting Information [Line Items]
Revenues	4,055,769	4,342,019	7,511,477	8,914,509
Operating segments | Black Oil
Segment Reporting Information [Line Items]
Revenues	38,469,131	27,384,402	70,706,377	52,188,485
Income (loss) from operations	2,969,532	(1,376,897)	2,210,180	(4,047,001)
Operating segments | Refining & Marketing
Segment Reporting Information [Line Items]
Revenues	4,392,870	5,186,358	10,068,111	10,580,399
Income (loss) from operations	(357,656)	(228,256)	(701,040)	(212,550)
Operating segments | Recovery
Segment Reporting Information [Line Items]
Revenues	4,055,769	4,342,019	7,511,477	8,914,509
Income (loss) from operations	$ 411,969	$ 46,976	$ 498,208	$ (59,463)