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v3.24.1.u1

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.

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 360 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//360/tableOfContent Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 6 -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480321/958-360-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d) -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480321/958-360-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 7 -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480321/958-360-50-7 + Details
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