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Income and expenses - Deferred tax (Details) - EUR (€) € in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Netting Of Deferred tax Asset | € 2,144 | € 1,798 | € 1,422
Total deferred tax assets | 3,971 | 3,523 | 2,797
Total deferred tax liabilities | (2,660) | (3,202) | (3,725)
Deferred income taxes | 1,363 | 1,128 | 2,277
Gross amount |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Total deferred tax assets | 6,115 | 5,320 | 4,220
Total deferred tax liabilities | (4,804) | (5,000) | (5,148)
Gross amount | Deferred tax asset |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred income taxes | 1,282 | 1,877 | 3,623
Gross amount | Deferred tax asset |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred income taxes | 81 | (749) | (1,345)
Tax losses, patent and innovation income deduction, and other tax credits | Gross amount |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Total deferred tax assets | 3,225 | 3,263 | 3,199
Amortization development assets and other intangible assets | Gross amount |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Total deferred tax assets | 2,016 | 1,357 | 400
Depreciation property, plant & equipment | Gross amount |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Total deferred tax assets | 384 | 338 | 224
Leases | Gross amount |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Total deferred tax assets | 129 | 48 | 53
Non deductible expenses | Gross amount |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Total deferred tax assets | 163 |  |
Other items | Gross amount |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Total deferred tax assets | 198 | 314 | 343
Total deferred tax liabilities | (74) | (27) |
Property, plant & equipment | Gross amount |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Total deferred tax liabilities | (980) | (541) | (569)
Intangible assets | Gross amount |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Total deferred tax liabilities | (3,637) | (3,847) | (3,664)
Deferred income | Gross amount |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Total deferred tax liabilities |  | (425) | (743)
Investment grants | Gross amount |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Total deferred tax liabilities | (11) | € (159) | € (172)
Prepaid expenses | Gross amount |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Total deferred tax liabilities | € (102) |  |

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