Property, plant and equipment (Tables)

12 Months Ended

Dec. 31, 2019

Property, plant and equipment

Schedule of Elements of property, plant and equipment

Elements of property, plant and equipment are as follows:

					Estimated
December 31,	2019		2018		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		13,273		13,369	15-30 years
- Equipment		24,953		24,078	3-10 years
- Equipment under capital lease		315		315	5-7 years
- Vehicles		1,574		1,535	3-5 years
- Lab and computer equipment, software		3,077		3,090	2-8 years
- Furniture & fixtures		679		684	5-10 years
- Leasehold improvements		842		873	3-5 years
- Equipment under construction		73		464
Subtotal		50,851		50,473
Accumulated depreciation		27,177		23,078
Total	$	23,674	$	27,395