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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)