Property, plant and equipment

6 Months Ended

Jun. 30, 2021

Property, plant and equipment

Property, plant and equipment

Note 4 - Property, plant and equipment

Elements of property, plant and equipment are as follows:

	June 30,		December 31,		Estimated
	2021		2020		Lives
(in thousands)	(unaudited)
Property, plant and equipment
- Land	$	1,255	$	1,255
- Land improvements		319		319	6-10 years
- Buildings		1,446		1,446	25-39 years
- Building improvements		3,099		3,072	25-39 years
- Cylinders		13,352		13,624	15-30 years
- Equipment		25,221		25,138	3-10 years
- Equipment under capital lease		315		315	5-7 years
- Vehicles		1,740		1,537	3-5 years
- Lab and computer equipment, software		3,103		3,103	2-8 years
- Furniture & fixtures		679		679	5-10 years
- Leasehold improvements		852		852	3-5 years
- Equipment under construction		1,321		944
Subtotal		52,702		52,284
Accumulated depreciation		32,068		30,374
Total	$	20,634	$	21,910

Depreciation expense for the six months ended June 30, 2021 and 2020 was $1.7 million and $2.1 million, respectively.