Property, plant and equipment

6 Months Ended

Jun. 30, 2019

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
	2019		2018		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		3,045		3,045	25‑39 years
- Cylinders		12,800		13,369	15‑30 years
- Equipment		24,619		24,078	3‑10 years
- Equipment under capital lease		315		315	5‑7 years
- Vehicles		1,574		1,535	3‑5 years
- Lab and computer equipment, software		3,090		3,090	2‑8 years
- Furniture & fixtures		684		684	5‑10 years
- Leasehold improvements		873		873	3‑5 years
- Equipment under construction		153		464
Subtotal		50,173		50,473
Accumulated depreciation		25,200		23,078
Total	$	24,973	$	27,395

Depreciation expense for the six months ended June 30, 2019 and 2018 was $2.1 million for both periods.