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Fair value measurements (Details 1) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Mar. 31, 2016 | Jun. 30, 2015 | Mar. 31, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Investment in OC-BVI |  |  |  |  |  |  |
Impairment of investment in OC-BVI (See Note 7) |  | $ 0 | $ 50,000 | $ 275,000 | $ 310,000 | $ 50,000 | $ 585,000
Net liability arising from put/call options |  |  |  |  |  |  |
Balance as of June 30, 2016 |  | 383,000 |  |  |  | 383,000 |
Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |  |
Investment in OC-BVI |  |  |  |  |  |  |
Balance as of December 31, 2015 |  |  | 4,548,271 |  |  | 4,548,271 |
Profit sharing and equity from earnings of OC-BVI |  |  |  |  |  | 179,822 |
Distributions received from OC-BVI |  |  |  |  |  | 0 |
Impairment of investment in OC-BVI (See Note 7) |  |  |  |  |  | (50,000) |
Balance as of June 30, 2016 |  | 4,678,093 |  |  |  | 4,678,093 |
Net liability arising from put/call options |  |  |  |  |  |  |
Balance as of December 31, 2015 | [1] |  | $ 0 |  |  | 0 |
Net liability arising from put/call options | [1] |  |  |  |  | 383,000 |
Balance as of June 30, 2016 | [1] | $ 383,000 |  |  |  | $ 383,000 |
[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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