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Property, plant and equipment and construction in progress (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 135,066,814	$ 133,029,585
Less accumulated depreciation	77,378,830	71,790,833
Property, Plant and Equipment, Net, Total	57,687,984	61,238,752
Construction in progress	440,384	1,335,597
Land [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	3,566,537	3,566,537
Building [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	23,250,843	23,176,106
Plant And Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	63,734,860	64,840,636
Distribution Systems [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	39,149,063	36,538,614
Office furniture, fixtures and equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	3,079,362	3,038,589
Vehicles [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	1,999,463	1,582,053
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	274,230	272,092
Lab equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 12,456	$ 14,958

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

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Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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