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Financial instruments (Details 1) | 12 Months Ended
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Dec. 31, 2017 USD ($)
Financial Instruments [Line Items] |  |
Beginning | $ (680,000) | [1]
Unrealized gain | 960,000 |
Ending | $ 280,000 | [2]
[1] | The net (liability) arising from the put/call options is included in other liabilities in the accompanying consolidated balance sheets as of December 31, 2016.
[2] | The net asset arising from the put/call options is included in other assets in the accompanying consolidated balance sheets as of December 31, 2017.

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