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Pension benefits (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]    
Pension Expense $ 202 $ 223
Defined Benefit Plan, Accumulated Benefit Obligation 2,000 $ 1,500
Defined Contribution Plan, Entities Matching Contribution, Amount $ 100