DISPOSITION - Additional Information (Details)			12 Months Ended
	Jan. 29, 2016 shares	Jan. 28, 2016 USD ($) a shares	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on Sale			$ 445	$ 9,631,712
Acquisition, cash paid			1,999,580	$ 0
Return of common shares for Safety-Kleen/Bango Sale Escrow			$ 0
Bango Plant | Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Area of land oil re-refining plant is located (in acres) | a		40
Aggregate purchase price		$ 35,000,000
Gain on Sale		9,748,561
Cash placed in escrow		1,500,000
Return of common shares for Safety-Kleen/Bango Sale Escrow		$ 1,000,000
Shares placed in escrow (in shares) | shares	1,108,928	1,108,928
Secured debt
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceed used to repay credit agreement		$ 16,100,000
Bango Oil, LLC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Acquisition, cash paid		9,300,000
Aggregate indemnification cap		3,000,000
Equipment leases
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Payments to acquire leased equipment		$ 1,500,000