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Accounts receivable (Tables) | 12 Months Ended
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Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Schedule of accounts receivable | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, |  | December 31,
​ | ​ | 2021 | ​ | 2020
Accounts receivable | ​ | $ | 48,680,634 | ​ | $ | 38,110,487
Allowance for doubtful accounts | ​ |  | (3,717,708) | ​ |  | (3,699,890)
Accounts receivable, net | ​ | $ | 44,962,926 | ​ | $ | 34,410,597
Accounts Receivable [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Schedule of allowance for doubtful accounts | The movement of allowance for doubtful accounts are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, | ​ | December 31,
​ | ​ | 2021 | ​ | 2020
Balance at beginning of period | ​ | $ | 3,699,890 | ​ | $ | 5,731,281
Change of allowance for doubtful accounts | ​ |  | (53,436) | ​ |  | (895,043)
Write off | ​ |  | (15,631) | ​ |  | (1,523,489)
Translation adjustments | ​ |  | 86,885 | ​ |  | 387,141
Balance at end of period | ​ | $ | 3,717,708 | ​ | $ | 3,699,890

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- Definition Tabular disclosure of allowance for credit loss on accounts receivable. + References Reference 1: 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=124255953&loc=SL82919249-210447 + Details
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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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