Property, plant and equipment (Tables)

3 Months Ended

Mar. 31, 2020

Property, plant and equipment

Schedule of elements of property, plant and equipment

Elements of property, plant and equipment are as follows:

	March 31,		December 31,		Estimated
	2020		2019		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		13,261		13,273	15-30 years
- Equipment		25,128		24,953	3-10 years
- Equipment under capital lease		315		315	5-7 years
- Vehicles		1,574		1,574	3-5 years
- Lab and computer equipment, software		3,103		3,077	2-8 years
- Furniture & fixtures		679		679	5-10 years
- Leasehold improvements		842		842	3-5 years
- Equipment under construction		72		73
Subtotal		51,039		50,851
Accumulated depreciation		28,255		27,177
Total	$	22,784	$	23,674