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Property, plant and equipment and construction in progress | 12 Months Ended
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Dec. 31, 2018
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment Disclosure [Text Block] | 8. Property, plant and equipment and construction in progress
|  | December 31, |
|  | 2018 |  |  | 2017 |
Land |  | $ | 3,435,361 |  |  | $ | 3,435,361 |
Buildings |  |  | 19,829,575 |  |  |  | 19,916,098 |
Plant and equipment |  |  | 61,777,836 |  |  |  | 58,873,604 |
Distribution system |  |  | 36,057,078 |  |  |  | 33,901,161 |
Office furniture, fixtures and equipment |  |  | 3,635,184 |  |  |  | 3,413,702 |
Vehicles |  |  | 1,431,719 |  |  |  | 1,444,182 |
Leasehold improvements |  |  | 244,221 |  |  |  | 237,027 |
Lab equipment |  |  | 27,795 |  |  |  | 157,838 |
|  |  | 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 |
As of December 31, 2018, the Company had outstanding capital commitments of $443,503. The Company maintains insurance for loss or damage to all fixed assets that it deems susceptible to loss. The Company does not insure its underground distribution system as the Company considers the possibility of material loss or damage to this system to be remote. During the years ended December 31, 2018 and 2017, $14,398,624 and $3,183,122, respectively, of construction in progress was placed in service. Depreciation expense was $5,514,881 and $5,746,865 for the years ended December 31, 2018 and 2017, respectively.

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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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