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Property, plant and equipment
6 Months Ended
Jun. 30, 2024
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

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

 

3,559

 

3,467

 

25-39 years

- Cylinders

 

13,039

 

13,220

 

15-30 years

- Equipment

 

30,480

 

29,397

 

3-10 years

- Equipment under capital lease

 

315

 

315

 

5-7 years

- Vehicles

 

1,941

 

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

 

2,633

 

2,844

 

  

Subtotal

 

60,209

 

59,084

 

  

Less: Accumulated depreciation

 

(41,092)

 

(39,709)

 

  

Total

$

19,117

$

19,375

 

  

Depreciation expense for the six months ended June 30, 2024 and 2023 was $1.6 million and $1.5 million, respectively.