Property, plant and equipment

6 Months Ended

Jun. 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:

	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

Depreciation expense for the six months ended June 30, 2023 and 2022 was $1.5 million and $1.7 million, respectively.