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Fair value measurements (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
Certificate of deposit	$ 1,000,000
Marketable Securities, Current	8,596,543	8,587,475
Total Recurring	9,596,543
Investment in OC-BVI	5,970,987	6,623,448
Fair Value, Inputs, Level 1 [Member]
Certificate of deposit	0
Marketable Securities, Current	8,596,543	8,587,475
Total Recurring	8,596,543
Investment in OC-BVI	0	0
Fair Value, Inputs, Level 2 [Member]
Certificate of deposit	1,000,000
Marketable Securities, Current	0	0
Total Recurring	1,000,000
Investment in OC-BVI	0	0
Fair Value, Inputs, Level 3 [Member]
Certificate of deposit	0
Marketable Securities, Current	0	0
Total Recurring	0
Investment in OC-BVI	$ 5,970,987	$ 6,623,448

X

- Definition

This item represents the portion of the balance sheet subject to fair value disclosure existing as of the balance sheet date for which fair value amounts are measured on a recurring basis.

+ References

No definition available.

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- Definition

Carrying value of amounts transferred to third parties for security purposes that are expected to be returned or applied towards payment in the future.

+ 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 210.5-02.17)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 17

-Article 5

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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

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-Section 45

-Paragraph 1

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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)

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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