Property, plant and equipment (Tables)

12 Months Ended

Dec. 31, 2020

Property, plant and equipment

Schedule of elements of property, plant and equipment

Elements of property, plant and equipment are as follows:

					Estimated
December 31,	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		3,072		3,045	25-39 years
- Cylinders		13,624		13,273	15-30 years
- Equipment		25,138		24,953	3-10 years
- Equipment under capital lease		315		315	5-7 years
- Vehicles		1,537		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		852		842	3-5 years
- Equipment under construction		944		73
Subtotal		52,284		50,851
Accumulated depreciation		30,374		27,177
Total	$	21,910	$	23,674