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Pension benefits (Tables) | 12 Months Ended
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Dec. 31, 2018
Retirement Benefits [Abstract] |
Schedule of Accumulated and Projected Benefit Obligations [Table Text Block] | The following table summarizes the amounts recognized in accumulated other comprehensive income (loss), net of taxes (in thousands):
|  | Years Ended December 31, |
|  | 2018 |  |  | 2017 |
Amortization of transition obligation |  | $ | 41 |  |  | $ | 38 |
Actuarial gain (loss) |  |  | 416 |  |  |  | (226 | )
Totals |  | $ | 457 |  |  | $ | (188 | )
Amounts in accumulated other comprehensive loss not yet reflected in net periodic pension cost, net of taxes: |  |  |  |  |  |  |  |
Actuarial gain |  | $ | 1,747 |  |  | $ | 1,331 |
Transition obligation |  |  | (91 | ) |  |  | (132 | )
Totals |  | $ | 1,656 |  |  | $ | 1,199 |
Amounts in accumulated other comprehensive loss expected to be amortized in 2019 net periodic pension cost, net of taxes: |  |  |  |  |  |  |  |
Actuarial gain |  | $ | (195 | ) |  |  |  |
Transition obligation |  |  | 36 |  |  |  |  |
Totals |  | $ | (159 | ) |  |  |  |
Schedule of Changes in Accumulated Postemployment Benefit Obligations [Table Text Block] | Benefit Obligations:
|  | 2018 |  |  | 2017 |
Projected benefit obligation at beginning of the year |  | $ | 3,121 |  |  | $ | 2,896 |
Service cost |  |  | 344 |  |  |  | 333 |
Interest cost |  |  | 198 |  |  |  | 187 |
Curtailment and other adjustments |  |  | 14 |  |  |  | (69 | )
Actuarial gain |  |  | (622 | ) |  |  | (107 | )
Foreign currency exchange rates changes |  |  | (251 | ) |  |  | 51 |
Benefits paid |  |  | (213 | ) |  |  | (170 | )
Projected benefit obligation at end of the year |  | $ | 2,591 |  |  | $ | 3,121 |
Schedule of Net Benefit Costs [Table Text Block] | Components of Net Periodic Pension Cost:
|  | 2018 |  |  | 2017 |
Service cost |  | $ | 344 |  |  | $ | 333 |
Interest cost |  |  | 198 |  |  |  | 187 |
Past service cost |  |  | 34 |  |  |  | - |
Curtailment |  |  | - |  |  |  | (69 | )
Actuarial gain recognized |  |  | 133 |  |  |  | (249 | )
Net periodic pension cost |  | $ | 709 |  |  | $ | 202 |
Schedule of post employment benefits [Table text block] | Amounts recognized in the consolidated balance sheets for the years ended December 31 consist of the following:
|  | 2018 |  |  | 2017 |
Current accrued benefit cost |  |  | 320 |  |  |  | 249 |
Non-current accrued benefit cost |  |  | 2,271 |  |  |  | 2,586 |
Net amount recognized |  |  | 2,591 |  |  |  | 2,835 |
Schedule of Assumptions Used [Table Text Block] | Actuarial assumptions for all non-U.S. plans are described below. The discount rates are used to measure the year end benefit obligations and the earnings effects for the subsequent year. The assumptions for each of the two years in the period ended December 31, 2018 are as follows:
|  | 2018 |  | 2017
Discount rate |  | 7.25%-12.17% |  | 5.78%-10.6%
Rate of increase in compensation level |  | 5%-7% |  | 5%-7%
Schedule of Expected Benefit Payments [Table Text Block] | Estimated Future Benefit Payments: The following benefit payments, which reflect expected future service, as appropriate, are expected to be paid (in thousands):
Years Ending December 31, |  |  |
2019 |  | $ | 320 |
2020 |  |  | 310 |
2021 |  |  | 168 |
2022 |  |  | 134 |
2023 |  |  | 159 |
2024 to 2028 |  |  | 1,736 |
|  | $ | 2,827 |

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