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Fair value measurements (Details 1) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Investment in OC-BVI |  |  |  |  |
Impairment loss on investment in OC-BVI |  | $ (875,000) | $ (225,000) | $ (925,000) | $ (810,000)
Net liability arising from put/call options |  |  |  |  |
Balance as of September 30, 2016 |  | 658,000 |  | 658,000 |
Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Investment in OC-BVI |  |  |  |  |
Balance as of December 31, 2015 |  |  |  | 4,548,271 |
Profit sharing and equity from earnings of OC-BVI |  |  |  | 319,598 |
Distributions received from OC-BVI |  |  |  | 0 |
Impairment loss on investment in OC-BVI |  |  |  | (925,000) |
Balance as of September 30, 2016 |  | 3,942,869 |  | 3,942,869 |
Net liability arising from put/call options |  |  |  |  |
Balance as of December 31, 2015 | [1] |  |  | 0 |
Issuance | [1] |  |  | 383,000 |
Unrealized loss | [1] |  |  | 275,000 |
Balance as of September 30, 2016 | [1] | $ 658,000 |  | $ 658,000 |
[1] | The net liability arising from the put/call options is included other liabilities in the accompanying condensed consolidated balance sheets as of September 30, 2016.

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