Note 6 - Property, Plant and Equipment

9 Months Ended

Sep. 30, 2020

Notes to Financial Statements

Property, Plant and Equipment Disclosure [Text Block]

6.

Property, Plant and Equipment

The following table sets forth the Company's property, plant and equipment by classification (in thousands):

	Useful Life			September 30,			December 31,
	(in years)			2020			2019
Luverne retrofit asset		20		$	70,820		$	70,820
Plant machinery and equipment		10			17,374			17,413
Site improvements		10			7,157			7,054
Lab equipment, furniture and fixtures and vehicles		5			6,396			6,393
Demonstration plant		2			3,597			3,597
Buildings		10			2,543			2,543
Leasehold improvements, pilot plant, land and support equipment	2	to	5		2,523			2,523
Computer, office equipment and software	3	to	6		2,021			2,034
Construction in progress					8,909			7,710
Total property, plant and equipment					121,340			120,087
Less accumulated depreciation and amortization					(58,016	)		(53,391	)
Property, plant and equipment, net				$	63,324		$	66,696

The Company recorded depreciation and amortization expense related to property, plant and equipment as follows (in thousands):

	Three Months Ended September 30 ,
	2020		2019
Cost of goods sold	$	1,418	$	1,578
Operating expenses		52		30
Total depreciation and amortization	$	1,470	$	1,608

	Nine Months Ended September 30 ,
	2020		2019
Cost of goods sold	$	4,580	$	4,697
Operating expenses		158		92
Total depreciation and amortization	$	4,738	$	4,789