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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 | 5. PROPERTY, PLANT, AND EQUIPMENT Property, plant, and equipment consist of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2022 |  | 2021
​ | ​ | ​ | ​ | ​ | ​ | ​
Land | ​ | $ | 261,893 | ​ | $ | 261,893
Buildings and building improvements | ​ |  | 25,038,429 | ​ |  | 24,364,084
Production equipment | ​ |  | 86,330,729 | ​ |  | 34,112,766
Office furniture and equipment | ​ |  | 4,811,703 | ​ |  | 4,089,362
Construction in progress | ​ |  | 15,896,433 | ​ |  | 52,681,005
​ | ​ |  | 132,339,187 | ​ |  | 115,509,110
Accumulated depreciation | ​ |  | (32,186,419) | ​ |  | (27,583,459)
​ | ​ | $ | 100,152,768 | ​ | $ | 87,925,651
​ Depreciation expense for the years ended December 31, 2022, 2021, and 2020 was $4,602,961; $1,257,417; and $832,069, 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 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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