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Fair value measurements (Details) - USD ($) | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Recurring |  |  |
Restricted cash |  | $ 0 | $ 428,203
Certificate of deposit |  | 0 | 5,637,538
Total recurring |  | 0 | 6,065,741
Nonrecurring |  |  |
Investment in OC-BVI |  | 4,678,093 | 4,548,271
Recurring |  |  |
Net liability arising from put/call options |  | 383,000 |
Fair Value, Inputs, Level 1 [Member] |  |  |
Recurring |  |  |
Restricted cash |  | 0 | 428,203
Certificate of deposit |  | 0 | 0
Total recurring |  | 0 | 428,203
Nonrecurring |  |  |
Investment in OC-BVI |  | 0 | 0
Recurring |  |  |
Net liability arising from put/call options |  | 0 |
Fair Value, Inputs, Level 2 [Member] |  |  |
Recurring |  |  |
Restricted cash |  | 0 | 0
Certificate of deposit |  | 0 | 5,637,538
Total recurring |  | 0 | 5,637,538
Nonrecurring |  |  |
Investment in OC-BVI |  | 0 | 0
Recurring |  |  |
Net liability arising from put/call options |  | 0 |
Fair Value, Inputs, Level 3 [Member] |  |  |
Recurring |  |  |
Restricted cash |  | 0 | 0
Certificate of deposit |  | 0 | 0
Total recurring |  | 0 | 0
Nonrecurring |  |  |
Investment in OC-BVI |  | 4,678,093 | 4,548,271
Recurring |  |  |
Net liability arising from put/call options | [1] | $ 383,000 | $ 0
[1] | The net liability arising from put/call options is included in the accompanying condensed consolidated balance sheets within other liabilities as of June 30, 2016.

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
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- Definition A savings certificate entitling the Entity (that is, bearer) to receive interest at an established maturity date, based upon a fixed interest rate. A certificate of deposit may be issued in any denomination. Certificates of deposit are generally issued by commercial banks and, therefore, insured by the FDIC (up to the prescribed limit). Certificates of deposit generally restrict holders from withdrawing funds on demand without the incurrence of penalties. Generally, only certificates of deposit with original maturities of three months or less qualify as cash equivalents. Original maturity means original maturity to the entity holding the investment. As a related example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 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 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Fair value portion of investments in an entity not consolidated. Includes, but is not limited to, investments in an entity that is affiliated with the reporting entity by means of direct or indirect ownership, an entity in which the reporting entity shares control of the entity with another party or group, an entity which the company has significant influence, but does not have control and subsidiaries that are not required to be consolidated and are accounted for using the equity or cost method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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- Definition The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. For a classified balance sheet represents the current portion only (the noncurrent portion has a separate concept); there is a separate and distinct element for unclassified presentations. + 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 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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