INTANGIBLE ASSETS, NET - Schedule of Goodwill and Components of Intangible Assets Subject to Amortization (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Accumulated Amortization	$ 11,962,858	$ 10,139,046
Net Carrying Amount	11,243,800
Gross Carrying Amount, Total	23,206,658	22,717,565
Net Carrying Amount, Total	11,243,800	12,578,519
Customer relations
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,329,580	1,329,580
Accumulated Amortization	884,917	718,890
Net Carrying Amount	$ 444,663	610,690
Vendor relations
Finite-Lived Intangible Assets [Line Items]
Useful Life (in years)	10 years
Gross Carrying Amount	$ 6,654,497	6,654,497
Accumulated Amortization	4,197,213	3,531,764
Net Carrying Amount	2,457,284	3,122,733
Trademark/Trade name
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,249,887	1,249,887
Accumulated Amortization	531,885	436,869
Net Carrying Amount	$ 718,002	813,018
TCEP Technology/Patent
Finite-Lived Intangible Assets [Line Items]
Useful Life (in years)	15 years
Gross Carrying Amount	$ 13,287,000	13,287,000
Accumulated Amortization	6,180,643	5,294,843
Net Carrying Amount	7,106,357	7,992,157
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	196,601	196,601
Accumulated Amortization	168,200	156,680
Net Carrying Amount	28,401	39,921
Internally developed software in progress
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	489,093	0
Accumulated Amortization	0	0
Net Carrying Amount	$ 489,093	$ 0
Minimum | Customer relations
Finite-Lived Intangible Assets [Line Items]
Useful Life (in years)	5 years
Minimum | Trademark/Trade name
Finite-Lived Intangible Assets [Line Items]
Useful Life (in years)	6 years
Minimum | Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Useful Life (in years)	3 years
Minimum | Internally developed software in progress
Finite-Lived Intangible Assets [Line Items]
Useful Life (in years)	3 years
Maximum | Customer relations
Finite-Lived Intangible Assets [Line Items]
Useful Life (in years)	8 years
Maximum | Trademark/Trade name
Finite-Lived Intangible Assets [Line Items]
Useful Life (in years)	16 years
Maximum | Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Useful Life (in years)	5 years
Maximum | Internally developed software in progress
Finite-Lived Intangible Assets [Line Items]
Useful Life (in years)	5 years