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Fair value measurements (Tables) | 9 Months Ended
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Sep. 30, 2016
Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] | The following table presents the Company’s fair value hierarchy for assets and liabilities measured at fair value as of September 30, 2016 and December 31, 2015:
|  | September 30, 2016 |
|  | Level 1 |  | Level 2 |  | Level 3 |  | Total |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Recurring |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash |  | $ | - |  | $ | - |  | $ | - |  | $ | - |
Certificate of deposit |  | $ | - |  | $ | - |  | $ | - |  | $ | - |
Nonrecurring |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in OC-BVI |  | $ | - |  | $ | - |  | $ | 3,942,869 |  | $ | 3,942,869 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Recurring |  |  |  |  |  |  |  |  |  |  |  |  |
Net liability arising from put/call options |  | $ | - |  | $ | - |  | $ | 658,000 |  | $ | 658,000 |
|  | December 31, 2015 |
|  | Level 1 |  | Level 2 |  | Level 3 |  | Total |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Recurring |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash |  | $ | 428,203 |  | $ | - |  | $ | - |  | $ | 428,203 |
Certificate of deposit |  |  | - |  |  | 5,637,538 |  |  | - |  |  | 5,637,538 |
Total recurring |  | $ | 428,203 |  | $ | 5,637,538 |  | $ | - |  | $ | 6,065,741 |
Nonrecurring |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in OC-BVI |  | $ | - |  | $ | - |  | $ | 4,548,271 |  | $ | 4,548,271 |
Fair Value, Inputs, Level 3 [Member] |
Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] | The activity for the Level 3 asset and liability for the nine months ended September 30, 2016 was as follows:
Investment in OC-BVI |  |  |  |
Balance as of December 31, 2015 |  | $ | 4,548,271 |
Profit sharing and equity from earnings of OC-BVI |  |  | 319,598 |
Distributions received from OC-BVI |  |  | - |
Impairment of investment in OC-BVI |  |  | (925,000) |
Balance as of September 30, 2016 |  | $ | 3,942,869 |
Net liability arising from put/call options[1] |  |  |  |
Balance as of December 31, 2015 |  | $ | - |
Issuance |  |  | 383,000 |
Unrealized loss |  |  | 275,000 |
Balance as of September 30, 2016 |  | $ | 658,000 |
___________________ (1) The net liability arising from the put/call options is included other liabilities in the accompanying condensed consolidated balance sheets as of September 30, 2016.

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- Definition Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19279-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2C -URI http://asc.fasb.org/extlink&oid=66048111&loc=SL7498348-110258 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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