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Property, plant and equipment and construction in progress | 12 Months Ended
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Dec. 31, 2021
Property, plant and equipment and construction in progress |
Property, plant and equipment and construction in progress | 7. Property, plant and equipment and construction in progress ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2021 |  | 2020
Land | ​ | $ | 3,316,537 | ​ | $ | 3,566,537
Buildings | ​ |  | 23,255,925 | ​ |  | 23,250,843
Plant and equipment | ​ |  | 64,324,377 | ​ |  | 63,734,860
Distribution system | ​ |  | 39,780,272 | ​ |  | 39,149,063
Office furniture, fixtures and equipment | ​ |  | 3,051,814 | ​ |  | 3,083,811
Vehicles | ​ |  | 2,079,874 | ​ |  | 1,999,463
Leasehold improvements | ​ |  | 287,980 | ​ |  | 274,230
Lab equipment | ​ |  | 12,456 | ​ |  | 12,456
​ | ​ |  | 136,109,235 | ​ |  | 135,071,263
Less accumulated depreciation | ​ |  | 83,162,696 | ​ |  | 77,383,279
Property, plant and equipment, net | ​ | $ | 52,946,539 | ​ | $ | 57,687,984
Construction in progress | ​ | $ | 710,863 | ​ | $ | 440,384
​ As of December 31, 2021, the Company had outstanding capital commitments of approximately $2.7 million. The Company maintains insurance for loss or damage to all fixed assets that it deems susceptible to loss. During the years ended December 31, 2021 and 2020, $644,224 and $1,653,501, respectively, of construction in progress was placed in service. Depreciation expense was $5,995,213 and $6,335,489 for the years ended December 31, 2021 and 2020, 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 http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://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 http://asc.fasb.org/extlink&oid=120429125&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 http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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