SEGMENT REPORTING (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information
Total revenues	$ 37,383,632	$ 37,799,259	$ 94,961,188	$ 120,777,263
Cost of revenues (exclusive of depreciation and amortization shown separately below)	31,186,684	32,372,316	80,221,343	103,732,086
Depreciation and amortization attributable to costs of revenues	1,313,162	1,359,629	3,731,320	3,965,626
Gross profit	4,883,786	4,067,314	11,008,525	13,079,551
Selling, general and administrative expenses	6,241,570	6,153,184	18,972,648	17,529,784
Depreciation and amortization attributable to operating expenses	482,869	455,953	1,412,719	1,367,859
Loss from operations	(1,840,653)	(2,541,823)	(9,376,842)	(5,818,092)
Base oil
Segment Reporting Information
Total revenues	6,365,772	9,776,292	20,006,371	26,357,561
Pygas
Segment Reporting Information
Total revenues	1,184,433	2,741,557	4,815,040	7,656,125
Industrial fuel
Segment Reporting Information
Total revenues	103,834	1,226,573	1,397,662	7,216,133
Distillates
Segment Reporting Information
Total revenues	12,234,672	0	17,359,234	54,697
Oil collection services
Segment Reporting Information
Total revenues	2,449,454	1,953,924	5,707,017	4,261,391
Metals
Segment Reporting Information
Total revenues	3,160,581	1,724,025	9,549,144	5,988,895
Other Re-refinery Products
Segment Reporting Information
Total revenues	834,438	3,084,778	4,289,343	10,482,298
VGO/Marine fuel sales
Segment Reporting Information
Total revenues	11,050,448	17,292,110	31,837,377	58,760,163
Black Oil
Segment Reporting Information
Total revenues	19,988,122	32,330,531	61,062,628	103,053,529
Cost of revenues (exclusive of depreciation and amortization shown separately below)	14,687,141	27,663,983	46,601,716	88,374,446
Depreciation and amortization attributable to costs of revenues	1,041,719	1,073,520	2,960,699	3,122,664
Gross profit	4,259,262	3,593,028	11,500,213	11,556,419
Selling, general and administrative expenses	4,899,956	5,040,772	15,180,569	14,500,306
Depreciation and amortization attributable to operating expenses	390,105	335,105	1,072,877	1,005,315
Loss from operations	(1,030,799)	(1,782,849)	(4,753,233)	(3,949,202)
Black Oil | Base oil
Segment Reporting Information
Total revenues	5,632,592	9,135,650	17,914,941	23,918,490
Black Oil | Pygas
Segment Reporting Information
Total revenues	0	0	0	0
Black Oil | Industrial fuel
Segment Reporting Information
Total revenues	21,190	891,676	1,262,266	5,714,478
Black Oil | Distillates
Segment Reporting Information
Total revenues	0	0	0	0
Black Oil | Oil collection services
Segment Reporting Information
Total revenues	2,449,454	1,953,924	5,707,017	4,261,391
Black Oil | Metals
Segment Reporting Information
Total revenues	0	0	0	0
Black Oil | Other Re-refinery Products
Segment Reporting Information
Total revenues	834,438	3,057,171	4,341,027	10,399,007
Black Oil | VGO/Marine fuel sales
Segment Reporting Information
Total revenues	11,050,448	17,292,110	31,837,377	58,760,163
Refining & Marketing
Segment Reporting Information
Total revenues	13,501,749	3,076,454	22,309,670	9,212,477
Cost of revenues (exclusive of depreciation and amortization shown separately below)	13,217,757	2,511,314	21,772,587	7,767,882
Depreciation and amortization attributable to costs of revenues	121,744	147,658	341,498	431,948
Gross profit	162,248	417,482	195,585	1,012,647
Selling, general and administrative expenses	696,611	494,781	1,867,027	1,424,572
Depreciation and amortization attributable to operating expenses	72,314	100,398	278,492	301,194
Loss from operations	(606,677)	(177,697)	(1,949,934)	(713,119)
Refining & Marketing | Base oil
Segment Reporting Information
Total revenues	0	0	0	0
Refining & Marketing | Pygas
Segment Reporting Information
Total revenues	1,184,433	2,741,557	4,815,040	7,656,125
Refining & Marketing | Industrial fuel
Segment Reporting Information
Total revenues	82,644	334,897	135,396	1,501,655
Refining & Marketing | Distillates
Segment Reporting Information
Total revenues	12,234,672	0	17,359,234	54,697
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	3,893,761	2,392,274	11,588,890	8,511,257
Cost of revenues (exclusive of depreciation and amortization shown separately below)	3,281,786	2,197,019	11,847,040	7,589,758
Depreciation and amortization attributable to costs of revenues	149,699	138,451	429,123	411,014
Gross profit	462,276	56,804	(687,273)	510,485
Selling, general and administrative expenses	645,003	617,631	1,925,052	1,604,906
Depreciation and amortization attributable to operating expenses	20,450	20,450	61,350	61,350
Loss from operations	(203,177)	(581,277)	(2,673,675)	(1,155,771)
Recovery | Base oil
Segment Reporting Information
Total revenues	733,180	640,642	2,091,430	2,439,071
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	0	0	0	0
Recovery | Metals
Segment Reporting Information
Total revenues	3,160,581	1,724,025	9,549,144	5,988,895
Recovery | Other Re-refinery Products
Segment Reporting Information
Total revenues	0	27,607	(51,684)	83,291
Recovery | VGO/Marine fuel sales
Segment Reporting Information
Total revenues	$ 0	$ 0	$ 0	$ 0