Note 6 - Property, Plant and Equipment

6 Months Ended

Jun. 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			June 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					8,802			7,710
Total property, plant and equipment					121,233			120,087
Less accumulated depreciation and amortization					(56,544	)		(53,391	)
Property, plant and equipment, net				$	64,689		$	66,696

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

	Three Months Ended June 30 ,
	2020		2019
Cost of goods sold	$	1,575	$	1,559
Operating expenses		50		52
Total depreciation and amortization	$	1,625	$	1,611

	Six Months Ended June 30 ,
	2020		2019
Cost of goods sold	$	3,162	$	3,119
Operating expenses		106		102
Total depreciation and amortization	$	3,268	$	3,221