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Fair value measurements (Details) (USD $) | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Recurring |  |
Certificate of deposit | $ 5,000,000 |
Marketable securities | 8,586,090 | 8,570,338
Total Recurring | 13,586,090 | 8,570,338
Nonrecurring |  |
Investment in OC-BVI | 6,930,384 | 6,925,346
Fair Value, Inputs, Level 1 [Member] |  |
Recurring |  |
Certificate of deposit | 0 |
Marketable securities | 8,586,090 | 8,570,338
Total Recurring | 8,586,090 | 8,570,338
Nonrecurring |  |
Investment in OC-BVI | 0 | 0
Fair Value, Inputs, Level 2 [Member] |  |
Recurring |  |
Certificate of deposit | 5,000,000 |
Marketable securities | 0 | 0
Total Recurring | 5,000,000 | 0
Nonrecurring |  |
Investment in OC-BVI | 0 | 0
Fair Value, Inputs, Level 3 [Member] |  |
Recurring |  |
Certificate of deposit | 0 |
Marketable securities | 0 | 0
Total Recurring | 0 | 0
Nonrecurring |  |
Investment in OC-BVI | $ 6,930,384 | $ 6,925,346

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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=16385135&loc=d3e33749-111570 + Details
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- Definition Amount of investments in debt and equity securities, including, but not limited to, held-to-maturity, trading and available-for-sale expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 2 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 + Details
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