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Accounts receivable, net | 12 Months Ended
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Dec. 31, 2017
Receivables [Abstract] |
Loans, Notes, Trade and Other Receivables Disclosure [Text Block] | 4. Accounts receivable, net
|  | December 31, |
|  | 2017 |  | 2016 |
Trade accounts receivable |  | $ | 13,609,203 |  | $ | 15,368,218 |
Receivable from OC-BVI |  |  | 123,807 |  |  | 53,970 |
Other accounts receivable |  |  | 1,473,738 |  |  | 1,271,948 |
|  |  | 15,206,748 |  |  | 16,694,136 |
Allowance for doubtful accounts |  |  | (158,902) |  |  | (193,338) |
Accounts receivable, net |  | $ | 15,047,846 |  | $ | 16,500,798 |
The activity for the allowance for doubtful accounts consisted of:
|  | December 31, |
|  | 2017 |  | 2016 |
Opening allowance for doubtful accounts |  | $ | 193,338 |  | $ | 193,338 |
Provision for doubtful accounts |  |  | - |  |  | 42,553 |
Accounts written off during the year |  |  | (34,436) |  |  | (42,553) |
Ending allowance for doubtful accounts |  | $ | 158,902 |  | $ | 193,338 |
Significant concentrations of credit risk are disclosed in Note 20.

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- Definition The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5066-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04(6)) -URI http://asc.fasb.org/extlink&oid=6488278&loc=d3e603758-122996 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5162-111524 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(5)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 + Details
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