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Property, plant and equipment and construction in progress (Details) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
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Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Gross | $ 126,438,769 | $ 121,378,973
Less accumulated depreciation | 67,557,951 | 71,695,202
Property, plant and equipment, net | 58,880,818 | 49,683,771
Construction in progress | 6,015,043 | 1,823,284
Land |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Gross | 3,435,361 | 3,435,361
Buildings [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Gross | 19,829,575 | 19,916,098
Plant and equipment |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Gross | 61,777,836 | 58,873,604
Distribution system [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Gross | 36,057,078 | 33,901,161
Office furniture, fixtures and equipment |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Gross | 3,635,184 | 3,413,702
Vehicles |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Gross | 1,431,719 | 1,444,182
Leasehold improvements [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Gross | 244,221 | 237,027
Lab equipment |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Gross | $ 27,795 | $ 157,838

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- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: 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=6877327&loc=d3e13212-122682 + Details
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