Property, plant and equipment (Tables)

6 Months Ended

Jun. 30, 2023

Property, plant and equipment

Schedule of elements of property, plant and equipment

	June 30,		December 31,		Estimated
	2023		2022		Lives
(in thousands)	(unaudited)
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		3,422		3,396	25-39 years
- Cylinders		13,300		13,315	15-30 years
- Equipment		28,205		27,258	3-10 years
- Equipment under capital lease		315		315	5-7 years
- Vehicles		1,736		1,773	3-5 years
- Lab and computer equipment, software		3,233		3,103	2-8 years
- Furniture & fixtures		930		840	5-10 years
- Leasehold improvements		852		852	3-5 years
- Construction-in-progress		3,192		3,533
Subtotal		58,205		57,405
Less: Accumulated depreciation		(38,296)		(36,837)
Total	$	19,909	$	20,568