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Trade Accounts and Bills Receivable, Net (Details 1) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Trade Accounts and Bills Receivable, net [Abstract] |  |
Balance at beginning of year | $ 4,650,686 | $ 3,657,173
Provision for the year | 1,656,128 | 1,613,402
Reversal - recoveries by cash | (934,391) | (567,042)
Charged to consolidated statements of operations and comprehensive (loss) income | 721,737 | 1,046,360
Write off | (431,684) |
Foreign exchange adjustment | 326,089 | (52,847)
Balance at end of year | $ 5,266,828 | $ 4,650,686

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- Definition Amount of allowance for credit loss on accounts receivable, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121599878&loc=SL82895884-210446 + Details
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