CONCENTRATIONS, SIGNIFICANT CUSTOMERS, COMMITMENTS AND CONTINGENCIES (Tables)

3 Months Ended

Mar. 31, 2021

Concentrations, Significant Customers, Commitments And Contingencies Disclosure [Abstract]

Schedule of concentrations

At March 31, 2021 and 2020 and for each of the three months then ended, the Company’s revenues and receivables were comprised of the following customer concentrations:

	Three Months Ended March 31, 2021		Three Months Ended March 31, 2020
	% of Revenues	% of Receivables	% of Revenues	% of Receivables
Customer 1	27%	15%	47%	23%
Customer 2	7%	17%	10%	18%
Customer 3	1%	4%	4%	11%
Customer 4	10%	7%	—%	—%

For each of the three months ended March 31, 2021 and 2020, the Company's segment revenues were comprised of the following customer concentrations:

	% of Revenue by Segment			% Revenue by Segment
	Three Months Ended March 31, 2021			Three Months Ended March 31, 2020
	Black Oil	Refining	Recovery	Black Oil	Refining	Recovery
Customer 1	48%	—%	—%	58%	—%	—%
Customer 2	13%	—%	—%	13%	—%	—%
Customer 3	—%	—%	9%	—%	—%	37%
Customer 4	—%	30%	—%	—%	—%	—%