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Fair value measurements (Tables) | 9 Months Ended
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Sep. 30, 2014
Fair Value Inputs [Abstract] |
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, 2014 and December 31, 2013:
|  | September 30, 2014 |
|  | Level 1 |  | Level 2 |  | Level 3 |  | Total |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |
Recurring |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash |  | $ | 498,929 |  | $ | - |  | $ | - |  | $ | 498,929 |
Certificate of deposit |  |  | - |  |  | 5,000,000 |  |  | - |  |  | 5,000,000 |
Total recurring |  | $ | 498,929 |  | $ | 5,000,000 |  | $ | - |  | $ | 5,498,929 |
Nonrecurring |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in OC-BVI |  | $ | - |  | $ | - |  | $ | 5,956,657 |  | $ | 5,956,657 |
|  | December 31, 2013 |
|  | Level 1 |  | Level 2 |  | Level 3 |  | Total |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |
Recurring |  |  |  |  |  |  |  |  |  |  |  |  |
Marketable securities |  | $ | 8,587,475 |  | $ | - |  | $ | - |  | $ | 8,587,475 |
Nonrecurring |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in OC-BVI |  | $ | - |  | $ | - |  | $ | 6,623,448 |  | $ | 6,623,448 |
Fair Value Measurements, Nonrecurring [Table Text Block] | The activity for Level 3 investments for the nine months ended September 30, 2014 was as follows:
Balance as of December 31, 2013 |  | $ | 6,623,448 |
Profit sharing and equity from earnings of OC-BVI |  |  | 302,809 |
Distributions received from OC-BVI |  |  | (969,600) |
Balance as of September 30, 2014 |  | $ | 5,956,657 |

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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=36462937&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 (a,b,bb) -URI http://asc.fasb.org/extlink&oid=36462937&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 2C -URI http://asc.fasb.org/extlink&oid=36462937&loc=SL7498348-110258 Reference 4: 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=36462937&loc=d3e19190-110258 + Details
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- Definition Tabular disclosure of assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). Disclosures may include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19296-110258 + Details
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