Property, plant and equipment (Tables)

12 Months Ended

Dec. 31, 2022

Property, plant and equipment

Schedule of elements of property, plant and equipment

Elements of property, plant and equipment are as follows:

					Estimated
December 31,	2022		2021		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		3,396		3,099	25-39 years
- Cylinders		13,315		13,272	15-30 years
- Equipment		27,258		26,653	3-10 years
- Equipment under capital lease		315		315	5-7 years
- Vehicles		1,773		1,773	3-5 years
- Lab and computer equipment, software		3,103		3,103	2-8 years
- Furniture & fixtures		840		837	5-10 years
- Leasehold improvements		852		852	3-5 years
- Construction-in-Progress		3,533		930
Subtotal		57,405		53,854
Less: Accumulated depreciation		(36,837)		(33,761)
Total	$	20,568	$	20,093