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Summary of significant accounting policies (Tables) | 12 Months Ended
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Dec. 31, 2018
Accounting Policies [Abstract] |
Property, plant and equipment | The Company depreciates all asset classes over their estimated useful lives, as follows:
Building | 20 - 25 years
Equipment | 7 - 10 years
Office furniture and equipment | 3 years
Leasehold improvements | shorter of asset life or lease term
Vehicles | 3 years
Major classifications of property, plant and equipment are summarized as follows for December 31, 2018 and 2017:
|  | 2018 |  | 2017
Land |  | $ | 704,567 |  |  | $ | 676,083 |
Building and improvements |  | 9,244,737 |  |  | 9,187,160 |
Construction in process |  | 6,091,265 |  |  | 5,119,961 |
Equipment |  | 9,713,030 |  |  | 8,211,510 |
Office furniture and equipment |  | 192,606 |  |  | 136,091 |
Vehicles |  | 26,832 |  |  | 29,135 |
Total property and equipment |  | $ | 25,973,037 |  |  | $ | 23,359,940 |
Less accumulated depreciation and amortization |  | (2,256,269 | ) |  | (1,556,964 | )
Property, plant and equipment, net |  | $ | 23,716,768 |  |  | $ | 21,802,976 |

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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 -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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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