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Property, plant and equipment and construction in progress | 12 Months Ended
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Dec. 31, 2020
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,
​ |  | 2020 |  | 2019
Land | ​ | $ | 3,566,537 | ​ | $ | 3,566,537
Buildings | ​ |  | 23,250,843 | ​ |  | 23,176,106
Plant and equipment | ​ |  | 63,734,860 | ​ |  | 64,840,636
Distribution system | ​ |  | 39,149,063 | ​ |  | 36,538,614
Office furniture, fixtures and equipment | ​ |  | 3,079,362 | ​ |  | 3,038,589
Vehicles | ​ |  | 1,999,463 | ​ |  | 1,582,053
Leasehold improvements | ​ |  | 274,230 | ​ |  | 272,092
Lab equipment | ​ |  | 12,456 | ​ |  | 14,958
​ | ​ |  | 135,066,814 | ​ |  | 133,029,585
Less accumulated depreciation | ​ |  | 77,378,830 | ​ |  | 71,790,833
Property, plant and equipment, net | ​ | $ | 57,687,984 | ​ | $ | 61,238,752
Construction in progress | ​ | $ | 440,384 | ​ | $ | 1,335,597
​ As of December 31, 2020, the Company had outstanding capital commitments of $29,145. The Company maintains insurance for loss or damage to all fixed assets that it deems susceptible to loss. The Company does not insure its underground distribution system as the Company considers the possibility of material loss or damage to this system to be remote. During the years ended December 31, 2020 and 2019, $1,653,501 and $7,755,375, respectively, of construction in progress was placed in service. Depreciation expense was $6,335,489 and $5,510,336 for the years ended December 31, 2020 and 2019, 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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