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Trade Accounts and Bills Receivable, Net (Details 1) - USD ($) | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Trade Accounts and Bills Receivable, net [Abstract] |  |
Balance at beginning of year | $ 3,657,173 | $ 3,700,922
Provision for the period | 241,549 | 11,199
Reversal - recoveries by cash | (170,387) | (97,852)
Charged to consolidated statements of operations and comprehensive (loss) income | 71,162 | (86,653)
Foreign exchange adjustment | 91,389 | 134,903
Balance at end of period | $ 3,819,724 | $ 3,749,172

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- Definition A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 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 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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