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Pension benefits (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]    
Pension Expense $ 709 $ 202
Defined Benefit Plan, Accumulated Benefit Obligation 1,700 2,000
Defined Contribution Plan Entities Matching Contribution Amount 100  
Quantifying Misstatement in Current Year Financial Statements, Amount 269  
Subsidiaries [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Pension Expense $ 700 $ 200