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Property, plant and equipment and construction in progress (Details) - USD ($) | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Gross | $ 145,171,425 | $ 139,782,227
Less accumulated depreciation | 89,288,904 | 87,252,682
Property, Plant and Equipment, Net, Total | 55,882,521 | 52,529,545
Construction in progress | 495,471 | 3,705,681
Land [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Gross | 6,488,400 | 6,488,400
Building [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Gross | 26,044,551 | 23,280,880
Plant And Equipment [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Gross | 66,000,977 | 64,532,994
Distribution Systems [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Gross | 39,546,175 | 39,544,395
Office furniture, fixtures and equipment [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Gross | 3,338,760 | 3,109,546
Vehicles [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Gross | 3,433,561 | 2,525,576
Leasehold Improvements [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Gross | 306,545 | 287,980
Lab equipment [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Gross | $ 12,456 | $ 12,456

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