PROPERTY, PLANT AND EQUIPMENT (Tables)

3 Months Ended

Mar. 31, 2021

Property, Plant and Equipment [Abstract]

Schedule of Plant, Pipeline and Equipment

Property, plant and equipment consisted of the following:
	March 31, 2021		December 31, 2020
	(thousands of dollars)
Platinum catalyst metal	$	1,580	$	1,580
Catalyst	4,298		4,325
Land	5,428		5,428
Plant, pipeline and equipment	271,960		270,149
Construction in progress	9,335		6,422
Total property, plant and equipment	$	292,601	$	287,904
Less accumulated depreciation	(104,678)		(100,800)
Total property, plant and equipment, net	$	187,923	$	187,104