REVENUES (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue
Total revenues	$ 65,194,911	$ 21,374,127	$ 123,278,904	$ 57,577,556
Base oil
Disaggregation of Revenue
Total revenues	12,928,334	5,474,972	22,337,543	13,640,599
Pygas
Disaggregation of Revenue
Total revenues	3,861,942	1,172,766	6,834,373	3,630,606
Industrial fuel
Disaggregation of Revenue
Total revenues	409,522	83,940	721,215	1,293,828
Distillates
Disaggregation of Revenue
Total revenues	19,565,227	5,124,562	35,555,056	5,124,562
Oil collection services
Disaggregation of Revenue
Total revenues	2,091,284	2,058,734	3,729,640	3,257,562
Metals
Disaggregation of Revenue
Total revenues	6,847,085	2,978,313	13,127,132	6,336,880
Other re-refinery products
Disaggregation of Revenue
Total revenues	2,152,438	849,885	3,620,667	3,506,589
VGO/Marine fuel sales
Disaggregation of Revenue
Total revenues	17,339,079	3,630,955	37,353,278	20,786,930
Northern United States
Disaggregation of Revenue
Total revenues	15,641,683	6,167,062	26,506,093	15,725,630
Southern United States
Disaggregation of Revenue
Total revenues	49,553,228	15,207,065	96,772,811	41,851,926
Black Oil
Disaggregation of Revenue
Total revenues	34,356,396	11,543,136	66,514,644	41,074,506
Black Oil | Base oil
Disaggregation of Revenue
Total revenues	12,928,334	4,919,622	22,042,228	12,282,349
Black Oil | Pygas
Disaggregation of Revenue
Total revenues	0	0	0	0
Black Oil | Industrial fuel
Disaggregation of Revenue
Total revenues	0	83,940	0	1,241,076
Black Oil | Distillates
Disaggregation of Revenue
Total revenues	0	0	0	0
Black Oil | Oil collection services
Disaggregation of Revenue
Total revenues	2,022,975	2,058,734	3,584,901	3,257,562
Black Oil | Metals
Disaggregation of Revenue
Total revenues	0	0	0	0
Black Oil | Other re-refinery products
Disaggregation of Revenue
Total revenues	2,066,008	849,885	3,534,237	3,506,589
Black Oil | VGO/Marine fuel sales
Disaggregation of Revenue
Total revenues	17,339,079	3,630,955	37,353,278	20,786,930
Black Oil | Northern United States
Disaggregation of Revenue
Total revenues	15,641,683	6,167,062	26,506,093	15,725,630
Black Oil | Southern United States
Disaggregation of Revenue
Total revenues	18,714,713	5,376,074	40,008,551	25,348,876
Refining & Marketing
Disaggregation of Revenue
Total revenues	23,836,691	6,297,328	43,110,644	8,807,920
Refining & Marketing | Base oil
Disaggregation of Revenue
Total revenues	0	0	0	0
Refining & Marketing | Pygas
Disaggregation of Revenue
Total revenues	3,861,942	1,172,766	6,834,373	3,630,606
Refining & Marketing | Industrial fuel
Disaggregation of Revenue
Total revenues	409,522	0	721,215	52,752
Refining & Marketing | Distillates
Disaggregation of Revenue
Total revenues	19,565,227	5,124,562	35,555,056	5,124,562
Refining & Marketing | Oil collection services
Disaggregation of Revenue
Total revenues	0	0	0	0
Refining & Marketing | Metals
Disaggregation of Revenue
Total revenues	0	0	0	0
Refining & Marketing | Other re-refinery products
Disaggregation of Revenue
Total revenues	0	0	0	0
Refining & Marketing | VGO/Marine fuel sales
Disaggregation of Revenue
Total revenues	0	0	0	0
Refining & Marketing | Northern United States
Disaggregation of Revenue
Total revenues	0	0	0	0
Refining & Marketing | Southern United States
Disaggregation of Revenue
Total revenues	23,836,691	6,297,328	43,110,644	8,807,920
Recovery
Disaggregation of Revenue
Total revenues	7,001,824	3,533,663	13,653,616	7,695,130
Recovery | Base oil
Disaggregation of Revenue
Total revenues	0	555,350	295,315	1,358,250
Recovery | Pygas
Disaggregation of Revenue
Total revenues	0	0	0	0
Recovery | Industrial fuel
Disaggregation of Revenue
Total revenues	0	0	0	0
Recovery | Distillates
Disaggregation of Revenue
Total revenues	0	0	0	0
Recovery | Oil collection services
Disaggregation of Revenue
Total revenues	68,309	0	144,739	0
Recovery | Metals
Disaggregation of Revenue
Total revenues	6,847,085	2,978,313	13,127,132	6,336,880
Recovery | Other re-refinery products
Disaggregation of Revenue
Total revenues	86,430	0	86,430	0
Recovery | VGO/Marine fuel sales
Disaggregation of Revenue
Total revenues	0	0	0	0
Recovery | Northern United States
Disaggregation of Revenue
Total revenues	0	0	0	0
Recovery | Southern United States
Disaggregation of Revenue
Total revenues	$ 7,001,824	$ 3,533,663	$ 13,653,616	$ 7,695,130