Property, plant and equipment

3 Months Ended

Mar. 31, 2019

Property, Plant and Equipment [Abstract]

Property, plant and equipment

Note 4 - Property, plant and equipment

Elements of property, plant and equipment are as follows:

	March 31, 2019		December 31, 2018		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		13,359		13,369	15-30 years
- Equipment		24,236		24,078	3-10 years
- Equipment under capital lease		315		315	5-7 years
- Vehicles		1,607		1,535	3-5 years
- Lab and computer equipment, software		3,090		3,090	2-8 years
- Furniture & fixtures		684		684	5-10 years
- Leasehold improvements		873		873	3-5 years
- Equipment under construction		409		464
Subtotal		50,638		50,473
Accumulated depreciation		24,136		23,078
Total	$	26,502	$	27,395

Depreciation expense for the three months ended March 31, 2019 and 2018 was $1.1 million and $1.0 million, respectively.