| Property, plant and equipment |
Note 4 - Property, plant and equipment Elements of property, plant and equipment are as follows: | | | | | | | | | | | March 31, | | December 31, | | Estimated | | | 2026 | | 2025 | | 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 | | | 3,714 | | | 3,714 | | 25-39 years | - Cylinders | | | 9,749 | | | 12,853 | | 15-30 years | - Equipment | | | 33,924 | | | 33,870 | | 3-10 years | - Equipment under capital lease | | | 315 | | | 315 | | 5-7 years | - Vehicles | | | 2,237 | | | 2,237 | | 3-5 years | - Lab and computer equipment, software | | | 10,234 | | | 3,339 | | 2-8 years | - Furniture and fixtures | | | 1,125 | | | 1,125 | | 5-10 years | - Leasehold improvements | | | 865 | | | 865 | | 3-5 years | - Construction-in-progress | | | 1,084 | | | 7,248 | | | Subtotal | | | 66,267 | | | 68,586 | | | Less: Accumulated depreciation | | | (43,741) | | | (44,963) | | | Total | | $ | 22,526 | | $ | 23,623 | | |
Depreciation expense for the three-month periods ended March 31, 2026 and 2025 was $0.9 million and $0.8 million, respectively, of which $0.7 million and $0.7 million, respectively, were included as cost of sales in the Company’s Consolidated Statements of Income.
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