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Financial instruments (Details 1) | 12 Months Ended
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Dec. 31, 2016 USD ($) | [1]
Financial Instruments [Line Items] |
Balance | $ 0
Net put/call option liability - Aerex | 383,000
Increase in net put/call option liability - Aerex | 297,000
Balance | $ 680,000
[1] | The net liability arising from the put/call options is included other liabilities in the accompanying condensed consolidated balance sheets as of December 31, 2016.

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