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4. PROPERTY, PLANT AND EQUIPMENT, NET (Details Narrative) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Property, Plant and Equipment [Abstract] |  |  |  |  |
Land | $ 20,882,068 |  | $ 20,882,068 |  | $ 20,409,998
Depreciation and amortization expense | 3,586,272 | $ 4,684,870 | 6,898,179 | $ 9,373,118 |
Direct labor and factory overheads incurred during plant shutdown | 2,019,128 | 4,420,180 | 5,086,024 | 8,857,147 |
Cost of administrative expenses | 222,444 | $ 262,689 | 447,274 | $ 515,971 |
Cost of net revenue | $ 1,344,700 |  | $ 1,364,881 |  |

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