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Trade Accounts and Bills Receivable, Net (Tables) | 12 Months Ended
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Dec. 31, 2020
Trade Accounts and Bills Receivable, net [Abstract] |
Schedule of trade accounts and bills receivable |
|  | December 31, |  |  | December 31, |
|  | 2019 |  |  | 2020 |
Trade accounts receivable |  | $ | 12,517,626 |  |  | $ | 33,305,997 |
Less: Allowance for doubtful accounts |  |  | (4,650,686 | ) |  |  | (5,266,828 | )
|  |  | 7,866,940 |  |  |  | 28,039,169 |
Bills receivable |  |  | 85,480 |  |  |  | 1,532,105 |
|  | $ | 7,952,420 |  |  | $ | 29,571,274 |
Schedule of analysis of the allowance for doubtful accounts |
|  | December 31, |  |  | December 31, |
|  | 2019 |  |  | 2020 |
Balance at beginning of year |  | $ | 3,657,173 |  |  | $ | 4,650,686 |
Provision for the year |  |  | 1,613,402 |  |  |  | 1,656,128 |
Reversal - recoveries by cash |  |  | (567,042 | ) |  |  | (934,391 | )
Charged to consolidated statements of operations and comprehensive (loss) income |  | $ | 1,046,360 |  |  | $ | 721,737 |
Write off |  |  | - |  |  |  | (431,684 | )
Foreign exchange adjustment |  |  | (52,847 | ) |  |  | 326,089 |
Balance at end of year |  | $ | 4,650,686 |  |  | $ | 5,266,828 |

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- Definition Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + 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 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Tabular disclosure of allowance for credit loss of financing receivable, classified as current. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 + Details
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