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PROPERTY, PLANT AND EQUIPMENT | 12 Months Ended
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Dec. 31, 2022
PROPERTY, PLANT AND EQUIPMENT |
PROPERTY, PLANT AND EQUIPMENT | NOTE 5: PROPERTY, PLANT AND EQUIPMENT Property, plant and equipment are presented at cost, net of accumulated depreciation, and consist of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Estimated | ​ | ​ | ​ | ​ | ​ | ​
December 31, |  | Useful Lives |  | 2022 |  | 2021
(in thousands) | ​ | ​ | ​ |  | ​ | ​ |  | ​
Land |  | N/A | ​ | $ | 895 | ​ | $ | 878
Buildings |  | 7-40 | ​ |  | 21,567 | ​ |  | 21,275
Operating equipment and property |  | 3-15 | ​ |  | 14,292 | ​ |  | 13,455
Furniture and fixtures |  | 5-7 | ​ |  | 2,991 | ​ |  | 2,779
Vehicles |  | 5-10 | ​ |  | 8,275 | ​ |  | 7,861
Gross property, plant and equipment |  | ​ | ​ |  | 48,020 | ​ |  | 46,248
Less: accumulated depreciation |  | ​ | ​ |  | (33,055) | ​ |  | (31,878)
Net property, plant and equipment | ​ | ​ | ​ | $ | 14,965 | ​ | $ | 14,370
​ Depreciation expense was $1,905,000 in 2022, $1,816,000 in 2021 and $1,954,000 in 2020. The Company’s accounts payable for purchases of property and equipment was immaterial as of December 31, 2022, December 31, 2021 and December 31, 2020.

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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 https://asc.fasb.org/extlink&oid=126982197&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI https://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 https://asc.fasb.org/extlink&oid=126982197&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 https://asc.fasb.org/extlink&oid=126982197&loc=d3e99779-112916 + Details
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