Property, plant and equipment

3 Months Ended

Mar. 31, 2023

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
	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		13,309		13,315	15-30 years
- Equipment		27,675		27,258	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		3,215		3,103	2-8 years
- Furniture & fixtures		926		840	5-10 years
- Leasehold improvements		852		852	3-5 years
- Construction-in-progress		3,310		3,533
Subtotal		57,817		57,405
Less: Accumulated depreciation		(37,588)		(36,837)
Total	$	20,229	$	20,568

Depreciation expense for the three months ended March 31, 2023 and 2022 was $0.8 million and $0.9 million, respectively.