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Property, plant and equipment and construction in progress (Tables) | 12 Months Ended
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Dec. 31, 2023
Property, plant and equipment and construction in progress |
Schedule of Property, plant and equipment and construction in progress | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2023 |  | 2022
Land | ​ | $ | 6,488,400 | ​ | $ | 6,488,400
Buildings | ​ |  | 26,044,551 | ​ |  | 23,280,880
Plant and equipment | ​ |  | 66,000,977 | ​ |  | 64,532,994
Distribution system | ​ |  | 39,546,175 | ​ |  | 39,544,395
Office furniture, fixtures and equipment | ​ |  | 3,338,760 | ​ |  | 3,109,546
Vehicles | ​ |  | 3,433,561 | ​ |  | 2,525,576
Leasehold improvements | ​ |  | 306,545 | ​ |  | 287,980
Lab equipment | ​ |  | 12,456 | ​ |  | 12,456
​ | ​ |  | 145,171,425 | ​ |  | 139,782,227
Less accumulated depreciation | ​ |  | 89,288,904 | ​ |  | 87,252,682
Property, plant and equipment, net | ​ | $ | 55,882,521 | ​ | $ | 52,529,545
Construction in progress | ​ | $ | 495,471 | ​ | $ | 3,705,681

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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 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 10 -Topic 360 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482099/360-10-50-1 + Details
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