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Property, plant and equipment | 12 Months Ended
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Dec. 31, 2023
Property, plant and equipment |
Property, plant and equipment | Note 5 - Property, plant and equipment Elements of property, plant and equipment are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Estimated
December 31, |  | 2023 |  | 2022 |  | Lives
(in thousands) | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
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 | ​ |  | 3,396 |  | 25-39 years
- Cylinders | ​ |  | 13,220 | ​ |  | 13,315 |  | 15-30 years
- Equipment | ​ |  | 29,397 | ​ |  | 27,258 |  | 3-10 years
- Equipment under capital lease | ​ |  | 315 | ​ |  | 315 |  | 5-7 years
- Vehicles | ​ |  | 1,790 | ​ |  | 1,773 |  | 3-5 years
- Lab and computer equipment, software | ​ |  | 3,233 | ​ |  | 3,103 |  | 2-8 years
- Furniture & fixtures | ​ |  | 933 | ​ |  | 840 |  | 5-10 years
- Leasehold improvements | ​ |  | 865 | ​ |  | 852 |  | 3-5 years
- Construction-in-Progress | ​ |  | 2,844 | ​ |  | 3,533 |  |
Subtotal | ​ |  | 59,084 | ​ |  | 57,405 |  |
Less: Accumulated depreciation | ​ |  | (39,709) | ​ |  | (36,837) |  |
Total | ​ | $ | 19,375 | ​ | $ | 20,568 |  |
​ Depreciation expense for the years ended December 31, 2023, 2022 and 2021 was $3.0 million, $3.2 million and $3.4 million, respectively, of which $2.0 million, $2.0 million and $1.9 million, respectively, were included as cost of sales in the Company’s Consolidated Income Statements.

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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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