INTANGIBLE ASSETS, NET - Narrative (Details) - USD ($)		12 Months Ended
	May 01, 2017	Dec. 31, 2019	Dec. 31, 2018	Apr. 30, 2018
Finite-Lived Intangible Assets [Line Items]
Amortization expense		$ 1,823,812	$ 1,818,854
Impairment of goodwill		$ 0	176,349
Nickco Recycling, LLC
Finite-Lived Intangible Assets [Line Items]
EBITDA target			461,000
Pre-agreed EBITDA target period				12 months
EBITDA				$ 334,000
EBITDA amount below target			$ 1,000,000
Nickco Recycling, LLC | Minimum
Finite-Lived Intangible Assets [Line Items]
EBITDA target	$ 700,000
EBITDA seller's earnout target				392,000
Nickco Recycling, LLC | Maximum
Finite-Lived Intangible Assets [Line Items]
EBITDA seller's earnout target				$ 567,000