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Financial instruments (Details) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Recurring |  |
Net put/call option liability |  | $ (680,000)
Net asset arising from put/call options | $ 280,000 |
Fair Value, Inputs, Level 1 [Member] |  |
Recurring |  |
Net put/call option liability |  | 0
Net asset arising from put/call options | 0 |
Fair Value, Inputs, Level 2 [Member] |  |
Recurring |  |
Net put/call option liability |  | 0
Net asset arising from put/call options | 0 |
Fair Value, Inputs, Level 3 [Member] |  |
Recurring |  |
Net put/call option liability |  | $ (680,000)
Net asset arising from put/call options | $ 280,000 |

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