REVENUES (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Disaggregation of Revenue [Line Items]
Total revenues	$ 37,799,259	$ 50,632,948	$ 120,777,263	$ 138,918,913
Petroleum products
Disaggregation of Revenue [Line Items]
Total revenues	36,075,234	48,260,878	114,788,368	130,095,778
Metals
Disaggregation of Revenue [Line Items]
Total revenues	1,724,025	2,372,070	5,988,895	8,823,135
Northern United States
Disaggregation of Revenue [Line Items]
Total revenues	12,325,941	12,361,348	31,530,289	31,314,405
Southern United States
Disaggregation of Revenue [Line Items]
Total revenues	25,473,318	38,271,600	89,246,974	107,604,508
Black Oil
Disaggregation of Revenue [Line Items]
Total revenues	32,330,531	40,400,064	103,053,529	111,106,441
Black Oil | Petroleum products
Disaggregation of Revenue [Line Items]
Total revenues	32,330,531	40,400,064	103,053,529	111,106,441
Black Oil | Metals
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Black Oil | Northern United States
Disaggregation of Revenue [Line Items]
Total revenues	12,325,941	12,361,348	31,530,289	31,314,405
Black Oil | Southern United States
Disaggregation of Revenue [Line Items]
Total revenues	20,004,590	28,038,716	71,523,240	79,792,036
Refining & Marketing
Disaggregation of Revenue [Line Items]
Total revenues	3,076,454	7,313,630	9,212,477	17,381,741
Refining & Marketing | Petroleum products
Disaggregation of Revenue [Line Items]
Total revenues	3,076,454	7,313,630	9,212,477	17,381,741
Refining & Marketing | Metals
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Refining & Marketing | Northern United States
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Refining & Marketing | Southern United States
Disaggregation of Revenue [Line Items]
Total revenues	3,076,454	7,313,630	9,212,477	17,381,741
Recovery
Disaggregation of Revenue [Line Items]
Total revenues	2,392,274	2,919,254	8,511,257	10,430,731
Recovery | Petroleum products
Disaggregation of Revenue [Line Items]
Total revenues	668,249	547,184	2,522,362	1,607,596
Recovery | Metals
Disaggregation of Revenue [Line Items]
Total revenues	1,724,025	2,372,070	5,988,895	8,823,135
Recovery | Northern United States
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Recovery | Southern United States
Disaggregation of Revenue [Line Items]
Total revenues	$ 2,392,274	$ 2,919,254	$ 8,511,257	$ 10,430,731