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Fair values (Tables) | 6 Months Ended
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Jun. 30, 2018
Disclosure of fair value measurement of assets [abstract] |
Fair value measurement |
| June 30, 2018 | Level 1 | Level 2 | Level 3
Liabilities for which fair values are disclosed |  |  |  |
Long term borrowings | 39,234 | - | 39,234 | -
| December 31, 2017 | Level 1 | Level 2 | Level 3
Liabilities for which fair values are disclosed |  |  |  |
Long term borrowings | 41,219 | - | 41,219 | -

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