Property, plant and equipment

3 Months Ended

Mar. 31, 2024

Property, plant and equipment

Property, plant and equipment

Note 4 - Property, plant and equipment

Elements of property, plant and equipment are as follows:

	March 31,		December 31,		Estimated
	2024		2023		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		3,467	25-39 years
- Cylinders		13,220		13,220	15-30 years
- Equipment		29,759		29,397	3-10 years
- Equipment under capital lease		315		315	5-7 years
- Vehicles		1,790		1,790	3-5 years
- Lab and computer equipment, software		3,233		3,233	2-8 years
- Furniture & fixtures		1,124		933	5-10 years
- Leasehold improvements		865		865	3-5 years
- Construction-in-progress		3,127		2,844
Subtotal		59,920		59,084
Less: Accumulated depreciation		(40,453)		(39,709)
Total	$	19,467	$	19,375

Depreciation expense for the three months ended March 31, 2024 and 2023 was $0.7 million and $0.8 million, respectively.