SEGMENT REPORTING (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information
Total revenues	$ 65,194,911	$ 21,374,127	$ 123,278,904	$ 57,577,556
Cost of revenues (exclusive of depreciation and amortization shown separately below)	52,904,991	22,197,805	96,251,265	49,034,659
Depreciation and amortization attributable to costs of revenues	1,393,350	1,239,564	2,741,170	2,415,986
Gross profit (loss)	10,896,570	(2,063,242)	24,286,469	6,126,911
Selling, general and administrative expenses	8,825,940	6,030,560	16,752,520	12,731,078
Depreciation and amortization attributable to operating expenses	482,869	473,897	965,738	932,033
Income (loss) from operations	1,587,761	(8,567,699)	6,568,211	(7,536,200)
Base oil
Segment Reporting Information
Total revenues	12,928,334	5,474,972	22,337,543	13,640,599
Pygas
Segment Reporting Information
Total revenues	3,861,942	1,172,766	6,834,373	3,630,606
Industrial fuel
Segment Reporting Information
Total revenues	409,522	83,940	721,215	1,293,828
Distillates
Segment Reporting Information
Total revenues	19,565,227	5,124,562	35,555,056	5,124,562
Oil collection services
Segment Reporting Information
Total revenues	2,091,284	2,058,734	3,729,640	3,257,562
Metals
Segment Reporting Information
Total revenues	6,847,085	2,978,313	13,127,132	6,336,880
Other re-refinery products
Segment Reporting Information
Total revenues	2,152,438	849,885	3,620,667	3,506,589
VGO/Marine fuel sales
Segment Reporting Information
Total revenues	17,339,079	3,630,955	37,353,278	20,786,930
Black Oil
Segment Reporting Information
Total revenues	34,356,396	11,543,136	66,514,644	41,074,506
Cost of revenues (exclusive of depreciation and amortization shown separately below)	24,165,394	11,848,334	44,001,840	31,914,575
Depreciation and amortization attributable to costs of revenues	1,089,417	982,085	2,163,678	1,918,980
Gross profit (loss)	9,101,585	(1,287,283)	20,349,126	7,240,951
Selling, general and administrative expenses	7,516,867	4,869,390	13,938,563	10,280,613
Depreciation and amortization attributable to operating expenses	353,947	347,667	707,895	682,783
Income (loss) from operations	1,230,771	(6,504,340)	5,702,668	(3,722,445)
Black Oil | Base oil
Segment Reporting Information
Total revenues	12,928,334	4,919,622	22,042,228	12,282,349
Black Oil | Pygas
Segment Reporting Information
Total revenues	0	0	0	0
Black Oil | Industrial fuel
Segment Reporting Information
Total revenues	0	83,940	0	1,241,076
Black Oil | Distillates
Segment Reporting Information
Total revenues	0	0	0	0
Black Oil | Oil collection services
Segment Reporting Information
Total revenues	2,022,975	2,058,734	3,584,901	3,257,562
Black Oil | Metals
Segment Reporting Information
Total revenues	0	0	0	0
Black Oil | Other re-refinery products
Segment Reporting Information
Total revenues	2,066,008	849,885	3,534,237	3,506,589
Black Oil | VGO/Marine fuel sales
Segment Reporting Information
Total revenues	17,339,079	3,630,955	37,353,278	20,786,930
Refining & Marketing
Segment Reporting Information
Total revenues	23,836,691	6,297,328	43,110,644	8,807,920
Cost of revenues (exclusive of depreciation and amortization shown separately below)	22,467,363	5,958,778	40,618,133	8,554,830
Depreciation and amortization attributable to costs of revenues	126,429	113,986	252,062	219,754
Gross profit (loss)	1,242,899	224,564	2,240,449	33,336
Selling, general and administrative expenses	688,108	578,027	1,447,518	1,170,416
Depreciation and amortization attributable to operating expenses	108,472	105,780	216,943	206,178
Income (loss) from operations	446,319	(459,243)	575,988	(1,343,258)
Refining & Marketing | Base oil
Segment Reporting Information
Total revenues	0	0	0	0
Refining & Marketing | Pygas
Segment Reporting Information
Total revenues	3,861,942	1,172,766	6,834,373	3,630,606
Refining & Marketing | Industrial fuel
Segment Reporting Information
Total revenues	409,522	0	721,215	52,752
Refining & Marketing | Distillates
Segment Reporting Information
Total revenues	19,565,227	5,124,562	35,555,056	5,124,562
Refining & Marketing | Oil collection services
Segment Reporting Information
Total revenues	0	0	0	0
Refining & Marketing | Metals
Segment Reporting Information
Total revenues	0	0	0	0
Refining & Marketing | Other re-refinery products
Segment Reporting Information
Total revenues	0	0	0	0
Refining & Marketing | VGO/Marine fuel sales
Segment Reporting Information
Total revenues	0	0	0	0
Recovery
Segment Reporting Information
Total revenues	7,001,824	3,533,663	13,653,616	7,695,130
Cost of revenues (exclusive of depreciation and amortization shown separately below)	6,272,234	4,390,693	11,631,292	8,565,254
Depreciation and amortization attributable to costs of revenues	177,504	143,493	325,430	277,252
Gross profit (loss)	552,086	(1,000,523)	1,696,894	(1,147,376)
Selling, general and administrative expenses	620,965	583,143	1,366,439	1,280,049
Depreciation and amortization attributable to operating expenses	20,450	20,450	40,900	43,072
Income (loss) from operations	(89,329)	(1,604,116)	289,555	(2,470,497)
Recovery | Base oil
Segment Reporting Information
Total revenues	0	555,350	295,315	1,358,250
Recovery | Pygas
Segment Reporting Information
Total revenues	0	0	0	0
Recovery | Industrial fuel
Segment Reporting Information
Total revenues	0	0	0	0
Recovery | Distillates
Segment Reporting Information
Total revenues	0	0	0	0
Recovery | Oil collection services
Segment Reporting Information
Total revenues	68,309	0	144,739	0
Recovery | Metals
Segment Reporting Information
Total revenues	6,847,085	2,978,313	13,127,132	6,336,880
Recovery | Other re-refinery products
Segment Reporting Information
Total revenues	86,430	0	86,430	0
Recovery | VGO/Marine fuel sales
Segment Reporting Information
Total revenues	$ 0	$ 0	$ 0	$ 0