Income taxes and deferred taxes - Additional information (Details) - EUR (€) |
6 Months Ended | ||
|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Dec. 31, 2025 |
|
| Income taxes and deferred taxes | |||
| Additional tax accrual for uncertain position | € 600,000 | € 286,000 | |
| Increase (Decrease) of income tax payable or reimbursed by subsidiaries. | 254,000 | € 121,000 | |
| Current tax liability | 4,020,000 | € 3,939,000 | |
| Uncertain tax positions | € 3,700,000 | ||