Note 5 - Property, Plant and Equipment

3 Months Ended

Mar. 31, 2018

Notes to Financial Statements

Property, Plant and Equipment Disclosure [Text Block]

5.

Property, Plant and Equipment

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

	Useful Life			March 31,			December 31,
	(in years)			2018			2017
Construction in progress				$	507		$	479
Plant machinery and equipment		10			16,285			16,284
Site improvements		10			7,051			7,051
Luverne retrofit asset		20			70,842			70,842
Lab equipment, furniture and fixtures and vehicles		5			6,513			6,513
Demonstration plant		2			3,597			3,597
Buildings		10			2,543			2,543
Computer, office equipment and software		3			1,807			1,795
Leasehold improvements, pilot plant, land and support equipment	2	-	5		2,536			2,536
Total property, plant and equipment					111,681			111,640
Less accumulated depreciation and amortization					(42,917	)		(41,271	)
Property, plant and equipment, net				$	68,764		$	70,369

Included in cost of goods sold is depreciation of

$1.6

million and

$1.5

million during the

three

months ended

March 31, 2018

and

2017,

respectively. 

Included in operating expenses is depreciation of

$0.1

million and

$0.1

million during the

three

months ended

March 31, 2018

and

2017,

respectively.