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Property, plant and equipment - Schedule of Property, Plant and Equipment (Details) - EUR (€) € in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment at beginning of period | € 6,251 | € 7,120
Decreases |  | 10
Transfer | 0 | 0
Currency translation | 0 | 0
Property, plant and equipment at end of period | 5,538 | 6,251
Gross book value of tangible assets | Fixtures, fittings and installations |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment at beginning of period | 3,321 | 3,318
Increases | 48 | 2
Decreases | 0 | 0
Transfer | 22 | 0
Currency translation | 0 | 0
Property, plant and equipment at end of period | 3,390 | 3,321
Gross book value of tangible assets | Right of use – Buildings |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment at beginning of period | 8,798 | 8,462
Increases | 228 | 337
Decreases | 0 | 0
Transfer | 0 | 0
Currency translation | 0 | 0
Property, plant and equipment at end of period | 9,026 | 8,798
Gross book value of tangible assets | Technical equipment |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment at beginning of period | 2,327 | 2,128
Increases | 166 | 113
Decreases | 0 | 215
Transfer | 0 | 300
Currency translation | 0 | 0
Property, plant and equipment at end of period | 2,492 | 2,327
Gross book value of tangible assets | Office and IT equipment |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment at beginning of period | 1,043 | 1,012
Increases | 227 | 41
Decreases | 0 | 9
Transfer | (15) | 0
Currency translation | 3 | (1)
Property, plant and equipment at end of period | 1,258 | 1,043
Gross book value of tangible assets | Transport equipment |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment at beginning of period | 34 | 36
Increases | 0 | 0
Decreases | 35 | 0
Transfer | 0 | 0
Currency translation | 1 | (1)
Property, plant and equipment at end of period | 0 | 34
Gross book value of tangible assets | Right of use – Transport equipment |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment at beginning of period | 0 | 0
Increases | 0 | 0
Decreases | 0 | 0
Transfer | 0 | 0
Currency translation | 0 | 0
Property, plant and equipment at end of period | 0 | 0
Gross book value of tangible assets | Tangible assets in progress |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment at beginning of period | 44 | 344
Increases | 94 | 0
Decreases | 0 | 0
Transfer | 3 | (300)
Currency translation | 0 | 0
Property, plant and equipment at end of period | 141 | 44
Gross book value of tangible assets | Prepayments on tangible assets |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment at beginning of period | 144 | 0
Increases | 141 | 144
Decreases | 0 | 0
Transfer | (35) | 0
Currency translation | 0 | 0
Property, plant and equipment at end of period | 250 | 144
Gross book value of tangible assets |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment at beginning of period | 15,712 | 15,299
Increases | 903 | 638
Decreases | 35 | 223
Transfer | (25) | 0
Currency translation | 3 | (3)
Property, plant and equipment at end of period | 16,559 | 15,712
Accumulated depreciation of tangible assets | Fixtures, fittings and installations |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment at beginning of period | (2,274) | (1,959)
Increases | (308) | (315)
Decreases | 0 | 0
Transfer | 0 | 0
Currency translation | 0 | 0
Property, plant and equipment at end of period | (2,582) | (2,274)
Accumulated depreciation of tangible assets | Right of use – Buildings |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment at beginning of period | (4,448) | (3,496)
Increases | (1,025) | (960)
Decreases | 0 | (8)
Transfer | 0 | 0
Currency translation | 0 | 0
Property, plant and equipment at end of period | (5,473) | (4,448)
Accumulated depreciation of tangible assets | Technical equipment |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment at beginning of period | (1,750) | (1,774)
Increases | (196) | (187)
Decreases | 0 | (211)
Transfer | 0 | 0
Currency translation | 0 | 0
Property, plant and equipment at end of period | (1,945) | (1,750)
Accumulated depreciation of tangible assets | Office and IT equipment |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment at beginning of period | (955) | (915)
Increases | (89) | (55)
Decreases | 0 | (14)
Transfer | 25 | 0
Currency translation | (2) | 1
Property, plant and equipment at end of period | (1,021) | (955)
Accumulated depreciation of tangible assets | Transport equipment |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment at beginning of period | (35) | (36)
Increases | 0 | 0
Decreases | (35) | 0
Transfer | 0 | 0
Currency translation | (1) | 1
Property, plant and equipment at end of period | 0 | (35)
Accumulated depreciation of tangible assets | Right of use – Transport equipment |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment at beginning of period | 0 | 0
Increases | 0 | 0
Decreases | 0 | 0
Transfer | 0 | 0
Currency translation | 0 | 0
Property, plant and equipment at end of period | 0 | 0
Accumulated depreciation of tangible assets |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment at beginning of period | (9,461) | (8,180)
Increases | (1,617) | (1,517)
Decreases | (35) | (233)
Transfer | 25 | 0
Currency translation | (3) | 2
Property, plant and equipment at end of period | (11,021) | (9,461)
Netting |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Increases | (714) | € (879)
Decreases | € 0 |

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- Definition The amount of additions to property, plant and equipment other than those acquired through business combinations. [Refer: Total for all business combinations [member]; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2024-01-01 -Paragraph 73 -Subparagraph e -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2024-en-r&anchor=para_73_e_i&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The decrease in property, plant and equipment resulting from disposals. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2024-01-01 -Paragraph 73 -Subparagraph e -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2024-en-r&anchor=para_73_e_ii&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The increase (decrease) in property, plant and equipment resulting from net exchange differences arising on the translation of the financial statements from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2024-01-01 -Paragraph 73 -Subparagraph e -Clause viii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2024-en-r&anchor=para_73_e_viii&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The increase (decrease) in property, plant and equipment resulting from transfers and changes that the entity does not separately disclose in the same statement or note. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 16 -IssueDate 2024-01-01 -Paragraph 73 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2024-en-r&anchor=para_73_e&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of tangible assets that: (a) are held for use in the production or supply of goods or services, for rental to others, or for administrative purposes; and (b) are expected to be used during more than one period. Note that right-of-use assets are not included. [Contrast: Property, plant and equipment including right-of-use assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2024-01-01 -Paragraph 73 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2024-en-r&anchor=para_73_e&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 54 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_54_a&doctype=Standard -URIDate 2024-03-27 + Details
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