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Property, plant and equipment and construction in progress (Tables) | 12 Months Ended
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Dec. 31, 2020
Property, plant and equipment and construction in progress |
Schedule of 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

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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