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v3.21.2

Property, plant and equipment | 6 Months Ended
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Jun. 30, 2021
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
​ | ​ | 2021 | ​ | 2020 | ​ | 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 | ​ |  | 3,099 | ​ |  | 3,072 |  | 25-39 years
- Cylinders | ​ |  | 13,352 | ​ |  | 13,624 |  | 15-30 years
- Equipment | ​ |  | 25,221 | ​ |  | 25,138 |  | 3-10 years
- Equipment under capital lease | ​ |  | 315 | ​ |  | 315 |  | 5-7 years
- Vehicles | ​ |  | 1,740 | ​ |  | 1,537 |  | 3-5 years
- Lab and computer equipment, software | ​ |  | 3,103 | ​ |  | 3,103 |  | 2-8 years
- Furniture & fixtures | ​ |  | 679 | ​ |  | 679 |  | 5-10 years
- Leasehold improvements | ​ |  | 852 | ​ |  | 852 |  | 3-5 years
- Equipment under construction | ​ |  | 1,321 | ​ |  | 944 |  |
Subtotal | ​ |  | 52,702 | ​ |  | 52,284 |  |
Accumulated depreciation | ​ |  | 32,068 | ​ |  | 30,374 |  |
Total | ​ | $ | 20,634 | ​ | $ | 21,910 |  |
​ Depreciation expense for the six months ended June 30, 2021 and 2020 was $1.7 million and $2.1 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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=120429125&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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