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Trade Accounts and Bills Receivable, Net (Details 1) - USD ($) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018
Trade Accounts and Bills Receivable, net [Abstract] |  |
Balance at beginning of period | $ 3,657,173 |
Provision for the period | 605,098 | $ 474,950
Reversal - recoveries by cash | (281,160) | (312,462)
Charged to consolidated statements of operations and comprehensive (loss) income | 323,938 | 162,488
Foreign exchange adjustment | 2,939 | (206,237)
Balance at end of period | $ 3,984,050 | $ 3,657,173

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