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Income taxes (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Operating Loss Carryforwards | $ 24,717 |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 25.00% | 26.50% | 26.50%
Other Noncurrent Assets [Member] |  |  |
Liability for Uncertainty in Income Taxes, Noncurrent | $ 24 |  |
Subsidiaries [Member] |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 35.00% |  |

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