Property, plant and equipment

6 Months Ended

Jun. 30, 2018

Property, Plant and Equipment [Abstract]

Property, plant and equipment

Note 4 - Property, plant and equipment

Elements of property, plant and equipment are as follows:

	June 30, ‎2018		December 31, ‎2017		Estimated ‎Lives
(in thousands)
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		3,045		3,045	25-39 years
- Cylinders		13,388		13,390	15-30 years
- Equipment		23,644		23,524	3-10 years
- Equipment under capital lease		315		315	5-7 years
- Vehicles		1,580		1,612	3-5 years
- Lab and computer equipment, software		3,055		3,056	2-8 years
- Furniture & fixtures		684		656	5-10 years
- Leasehold improvements		864		711	3-5 years
- Equipment under construction		610		385
Subtotal		50,205		49,714
Accumulated depreciation		21,042		19,253
Total	$	29,163	$	30,461

Depreciation expense for the six months ended June 30, 2018 and 2017 was $2.1 million and $1.0 million, respectively.