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Property, plant and equipment | 12 Months Ended
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Dec. 31, 2017
Property, Plant and Equipment [Abstract] |
Property, plant and equipment | Note 5 - Property, plant and equipment Elements of property, plant and equipment are as follows:
December 31 , |  | 2017 |  | 2016 |  | Estimated Lives |
(in thousands) |  |  |  |  |  |  |  |  |
Property, plant and equipment |  |  |  |  |  |  |  |  |
- Land |  | $ | 1,255 |  | $ | 535 |  |  |
- Land improvements |  |  | 319 |  |  | — |  | 6-10 years |
- Buildings |  |  | 1,446 |  |  | 830 |  | 25-39 years |
- Building improvements |  |  | 3,045 |  |  | 873 |  | 25-39 years |
- Cylinders |  |  | 13,390 |  |  | — |  | 15-30 years |
- Equipment |  |  | 23,524 |  |  | 13,423 |  | 3-10 years |
- Equipment under capital lease |  |  | 315 |  |  | 248 |  | 5-7 years |
- Vehicles |  |  | 1,612 |  |  | 1,360 |  | 3-5 years |
- Lab and computer equipment, software |  |  | 3,056 |  |  | 2,652 |  | 2-8 years |
- Furniture &; fixtures |  |  | 656 |  |  | 289 |  | 5-10 years |
- Leasehold improvements |  |  | 711 |  |  | 119 |  | 3-5 years |
- Equipment under construction |  |  | 385 |  |  | 1,654 |  |  |
Subtotal |  |  | 49,714 |  |  | 21,983 |  |  |
Accumulated depreciation |  |  | 19,253 |  |  | 14,451 |  |  |
Total |  | $ | 30,461 |  | $ | 7,532 |  |  |
Depreciation expense for the years ended December 31, 2017, 2016 and 2015 was $ 2.3 million, $1.7 million, and $1.6 million, respectively, of which $2.0 million, $1.7 million, and $1.5 million, respectively, were included as cost of sales in the Company’s Consolidated Statements of Operations.

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- References No definition available. + Details
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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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