REVENUES (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Disaggregation of Revenue [Line Items]
Revenues	$ 46,917,770	$ 36,912,779	$ 88,285,965	$ 71,683,393
Petroleum products
Disaggregation of Revenue [Line Items]
Revenues	43,545,271	34,475,245	81,834,900	68,873,587
Metals
Disaggregation of Revenue [Line Items]
Revenues	3,372,499	2,437,534	6,451,065	2,809,806
Northern United States
Disaggregation of Revenue [Line Items]
Revenues	10,115,827	8,782,587	18,953,057	14,535,599
Southern United States
Disaggregation of Revenue [Line Items]
Revenues	36,801,943	28,130,192	69,332,908	57,147,794
Black Oil
Disaggregation of Revenue [Line Items]
Revenues	38,469,131	27,384,402	70,706,377	52,188,485
Black Oil | Petroleum products
Disaggregation of Revenue [Line Items]
Revenues	38,469,131	27,384,402	70,706,377	52,188,485
Black Oil | Metals
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Black Oil | Northern United States
Disaggregation of Revenue [Line Items]
Revenues	10,115,827	8,782,587	18,953,057	14,535,599
Black Oil | Southern United States
Disaggregation of Revenue [Line Items]
Revenues	28,353,304	18,601,815	51,753,320	37,652,886
Refining & Marketing
Disaggregation of Revenue [Line Items]
Revenues	4,392,870	5,186,358	10,068,111	10,580,399
Refining & Marketing | Petroleum products
Disaggregation of Revenue [Line Items]
Revenues	4,392,870	5,186,358	10,068,111	10,580,399
Refining & Marketing | Metals
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Refining & Marketing | Northern United States
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Refining & Marketing | Southern United States
Disaggregation of Revenue [Line Items]
Revenues	4,392,870	5,186,358	10,068,111	10,580,399
Recovery
Disaggregation of Revenue [Line Items]
Revenues	4,055,769	4,342,019	7,511,477	8,914,509
Recovery | Petroleum products
Disaggregation of Revenue [Line Items]
Revenues	683,270	1,904,485	1,060,412	6,104,703
Recovery | Metals
Disaggregation of Revenue [Line Items]
Revenues	3,372,499	2,437,534	6,451,065	2,809,806
Recovery | Northern United States
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Recovery | Southern United States
Disaggregation of Revenue [Line Items]
Revenues	$ 4,055,769	$ 4,342,019	$ 7,511,477	$ 8,914,509