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Share-based payment plans - Share-based payment plans of RapidFit narrative (Details) - EUR (€) € / shares in Units, € in Thousands | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Share-based payment plans |  |  |
Share-based payment expense | € 266 | € 285 | € 47
Rapidfit+ plan |  |  |
Share-based payment plans |  |  |
Maximum number of warrants | 300 |  |
Share-based payment expense | € 0 | € 0 | € 0
Exercise price, share options granted | € 553.9 |  |

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- References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2025-01-01 -Paragraph 51 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2025-en-r&anchor=para_51_a&doctype=Standard -URIDate 2025-03-27 + Details
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- Details
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