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Accounts receivable, net (Tables) | 12 Months Ended
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Dec. 31, 2022
Accounts receivable, net. |
Schedule of Accounts receivable | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2022 |  | 2021
Trade accounts receivable | ​ | $ | 27,163,719 | ​ | $ | 27,311,188
Receivable from OC-BVI | ​ |  | 37,293 | ​ |  | 40,877
Other accounts receivable | ​ |  | 28,384 | ​ |  | 180,262
​ | ​ |  | 27,229,396 | ​ |  | 27,532,327
Allowance for doubtful accounts | ​ |  | (183,214) | ​ |  | (183,020)
Accounts receivable, net | ​ | $ | 27,046,182 | ​ | $ | 27,349,307
​
Schedule of Allowance for doubtful accounts | The activity for the allowance for doubtful accounts consisted of: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2022 |  | 2021
Opening allowance for doubtful accounts | ​ | $ | 183,020 | ​ | $ | 172,269
Provision for doubtful accounts | ​ |  | — | ​ |  | —
Accounts written off during the year | ​ |  | (726) | ​ |  | —
Recovery of accounts written off | ​ | ​ | 920 | ​ | ​ | 10,751
Ending allowance for doubtful accounts | ​ | $ | 183,214 | ​ | $ | 183,020
​

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- Definition Tabular disclosure of allowance for credit loss on financing receivable. + 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 -URI https://asc.fasb.org/extlink&oid=123577603&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 https://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 https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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