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Property, plant and equipment and construction in progress (Tables) | 12 Months Ended
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Dec. 31, 2021
Property, plant and equipment and construction in progress |
Schedule of 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

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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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