REVENUES (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Revenues	$ 39,320,712	$ 41,368,195
Petroleum products
Disaggregation of Revenue [Line Items]
Revenues	36,885,323	38,289,629
Metals
Disaggregation of Revenue [Line Items]
Revenues	2,435,389	3,078,566
Northern United States
Disaggregation of Revenue [Line Items]
Revenues	9,323,782	8,837,230
Southern United States
Disaggregation of Revenue [Line Items]
Revenues	29,996,930	32,530,965
Black Oil
Disaggregation of Revenue [Line Items]
Revenues	32,815,187	32,237,246
Black Oil | Petroleum products
Disaggregation of Revenue [Line Items]
Revenues	32,815,187	32,237,246
Black Oil | Metals
Disaggregation of Revenue [Line Items]
Revenues	0	0
Black Oil | Northern United States
Disaggregation of Revenue [Line Items]
Revenues	9,323,782	8,837,230
Black Oil | Southern United States
Disaggregation of Revenue [Line Items]
Revenues	23,491,405	23,400,016
Refining & Marketing
Disaggregation of Revenue [Line Items]
Revenues	2,858,621	5,675,241
Refining & Marketing | Petroleum products
Disaggregation of Revenue [Line Items]
Revenues	2,858,621	5,675,241
Refining & Marketing | Metals
Disaggregation of Revenue [Line Items]
Revenues	0	0
Refining & Marketing | Northern United States
Disaggregation of Revenue [Line Items]
Revenues	0	0
Refining & Marketing | Southern United States
Disaggregation of Revenue [Line Items]
Revenues	2,858,621	5,675,241
Recovery
Disaggregation of Revenue [Line Items]
Revenues	3,646,904	3,455,708
Recovery | Petroleum products
Disaggregation of Revenue [Line Items]
Revenues	1,211,515	377,142
Recovery | Metals
Disaggregation of Revenue [Line Items]
Revenues	2,435,389	3,078,566
Recovery | Northern United States
Disaggregation of Revenue [Line Items]
Revenues	0	0
Recovery | Southern United States
Disaggregation of Revenue [Line Items]
Revenues	$ 3,646,904	$ 3,455,708