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Accounts receivable, net (Tables) | 12 Months Ended
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Dec. 31, 2018
Receivables [Abstract] |
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] |
|  | December 31, |
|  | 2018 |  |  | 2017 |
Trade accounts receivable |  | $ | 22,331,720 |  |  | $ | 13,341,438 |
Receivable from OC-BVI |  |  | 46,600 |  |  |  | 123,807 |
Other accounts receivable |  |  | 2,008,677 |  |  |  | 1,380,735 |
|  |  | 24,386,997 |  |  |  | 14,845,980 |
Allowance for doubtful accounts |  |  | (158,902 | ) |  |  | (158,902 | )
Accounts receivable, net |  | $ | 24,228,095 |  |  | $ | 14,687,078 |
Allowance for Credit Losses on Financing Receivables [Table Text Block] | The activity for the allowance for doubtful accounts consisted of:
|  | December 31, |
|  | 2018 |  |  | 2017 |
Opening allowance for doubtful accounts |  | $ | 158,902 |  |  | $ | 193,338 |
Provision for doubtful accounts |  |  | - |  |  |  | - |
Accounts written off during the year |  |  | - |  |  |  | (34,436 | )
Ending allowance for doubtful accounts |  | $ | 158,902 |  |  | $ | 158,902 |

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- Definition Tabular disclosure of financing receivables (examples of financing receivables include loans, trade accounts receivable and notes receivable) and activity in the allowance for credit losses account. + 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 http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + 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=6877327&loc=d3e13212-122682 + Details
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