Property, plant and equipment

9 Months Ended

Sep. 30, 2023

Property, plant and equipment

Property, plant and equipment

Note 4 - Property, plant and equipment

Elements of property, plant and equipment are as follows:

	September 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		3,467		3,396	25-39 years
- Cylinders		13,300		13,315	15-30 years
- Equipment		28,920		27,258	3-10 years
- Equipment under capital lease		315		315	5-7 years
- Vehicles		1,789		1,773	3-5 years
- Lab and computer equipment, software		3,233		3,103	2-8 years
- Furniture & fixtures		933		840	5-10 years
- Leasehold improvements		865		852	3-5 years
- Construction-in-progress		3,741		3,533
Subtotal		59,583		57,405
Less: Accumulated depreciation		(39,013)		(36,837)
Total	$	20,570	$	20,568

Depreciation expense for the nine months ended September 30, 2023 and 2022 was $2.2 million and $2.5 million, respectively.