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Loans and borrowings - Narrative (Details) € in Thousands | 1 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 31, 2022 EUR (€) tranche | Mar. 31, 2018 EUR (€) item | Oct. 31, 2017 EUR (€) | Dec. 31, 2025 EUR (€) | Dec. 31, 2024 EUR (€) | Dec. 31, 2023 EUR (€) | Dec. 31, 2019 EUR (€) | Dec. 31, 2018 EUR (€) | Jun. 30, 2018 EUR (€) | Dec. 31, 2017 EUR (€) | Dec. 31, 2016 EUR (€)
Loans and borrowings |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  | € 63,113 | € 41,284 | € 64,398 |  |  |  |  |
Payments of lease liabilities, classified as financing activities |  |  |  | 3,067 | 3,122 | 3,549 |  |  |  |  |
K€50,000 KBC credit facility |  |  |  |  |  |  |  |  |  |  |
Loans and borrowings |  |  |  |  |  |  |  |  |  |  |
Notional amount | € 50,000 |  |  | 50,000 |  |  |  |  |  |  |
Reservation cost percentage | 0.15% |  |  |  |  |  |  |  |  |  |
Number of tranches | tranche | 3 |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  | 35,000 |  |  |  |  |  |  |
K€50,000 KBC credit facility, Tranche One |  |  |  |  |  |  |  |  |  |  |
Loans and borrowings |  |  |  |  |  |  |  |  |  |  |
Notional amount | € 20,000 |  |  |  |  |  |  |  |  |  |
Interest rate percentage | 3.56% |  |  |  |  |  |  |  |  |  |
K€50,000 KBC credit facility, Tranche Two |  |  |  |  |  |  |  |  |  |  |
Loans and borrowings |  |  |  |  |  |  |  |  |  |  |
Notional amount | € 15,000 |  |  |  |  |  |  |  |  |  |
Interest rate percentage | 3.81% |  |  |  |  |  |  |  |  |  |
K€50,000 KBC credit facility, Tranche Three |  |  |  |  |  |  |  |  |  |  |
Loans and borrowings |  |  |  |  |  |  |  |  |  |  |
Notional amount | € 15,000 |  |  |  |  |  |  |  |  |  |
Interest rate percentage | 3.87% |  |  |  |  |  |  |  |  |  |
K€35,000 EIB bank loan |  |  |  |  |  |  |  |  |  |  |
Loans and borrowings |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  |  |  | € 35,000 |
Borrowings |  |  |  | 10,000 | 15,833 | 21,667 |  |  |  |  |
K€35,000 EIB bank loan, tranche one |  |  |  |  |  |  |  |  |  |  |
Loans and borrowings |  |  |  |  |  |  |  |  |  |  |
Interest rate percentage |  |  |  |  |  |  |  | 2.40% |  |  |
Borrowings |  |  |  |  |  |  |  | € 10,000 |  |  |
K€35,000 EIB bank loan, tranche two |  |  |  |  |  |  |  |  |  |  |
Loans and borrowings |  |  |  |  |  |  |  |  |  |  |
Interest rate percentage |  |  |  |  |  |  | 2.72% |  |  |  |
Borrowings |  |  |  |  |  |  | € 25,000 |  |  |  |
K€28,000 acquisition bank loan |  |  |  |  |  |  |  |  |  |  |
Loans and borrowings |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  | € 28,000 |  |  |  |  |  |  |  |
Interest rate percentage |  |  | 1.10% |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  | 10,000 |  |  |  |  |
K€28,000 Acquisition Bank Loan, tranche one |  |  |  |  |  |  |  |  |  |  |
Loans and borrowings |  |  |  |  |  |  |  |  |  |  |
Reimbursable term |  |  | 5 years |  |  |  |  |  |  |  |
Borrowings |  |  | € 18,000 |  |  |  |  |  |  |  |
K€28,000 Acquisition Bank Loan, tranche two |  |  |  |  |  |  |  |  |  |  |
Loans and borrowings |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  | € 10,000 |  |  |  |  |  |  |  |
K€17,700 secured bank loans |  |  |  |  |  |  |  |  |  |  |
Loans and borrowings |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  |  |  |  | € 17,700
Interest rate percentage |  |  |  |  |  |  |  |  |  |  | 1.20%
Borrowings |  |  |  | 11,773 | 13,348 | 14,904 |  |  |  |  | € 17,700
K€17,700 secured bank loans, tranche one |  |  |  |  |  |  |  |  |  |  |
Loans and borrowings |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  | 11,700
K€17,700 secured bank loans, tranche two. |  |  |  |  |  |  |  |  |  |  |
Loans and borrowings |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  | € 6,000
K€12,300 bank loans |  |  |  |  |  |  |  |  |  |  |
Loans and borrowings |  |  |  |  |  |  |  |  |  |  |
Notional amount |  | € 12,300 |  |  |  |  |  |  |  |  |
Interest rate percentage |  | 1.60% |  |  |  |  |  |  |  |  |
Number of loans originated | item |  | 3 |  |  |  |  |  |  |  |  |
Asset-backed debt instruments held |  | € 4,650 |  |  |  |  |  |  |  |  |
Borrowings |  | € 9,300 |  |  |  |  |  |  |  |  |
K€12,300 bank loans | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |
Loans and borrowings |  |  |  |  |  |  |  |  |  |  |
Interest rate percentage |  |  |  |  |  |  |  |  | 1.50% |  |
Borrowings |  |  |  |  |  |  |  |  | € 3,000 |  |
K€12,300 bank loans ACTech |  |  |  |  |  |  |  |  |  |  |
Loans and borrowings |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  | 1,230 | 3,546 |  |  |  |  |
K€5,000 other facility loan |  |  |  |  |  |  |  |  |  |  |
Loans and borrowings |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  | € 5,000 |  |  |  |  |  |  |
Reimbursable term |  |  |  | 15 years |  |  |  |  |  |  |
Borrowings |  |  |  |  | 1,094 | 1,496 |  |  |  |  |
K€5,000 other facility loan | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |
Loans and borrowings |  |  |  |  |  |  |  |  |  |  |
Interest rate percentage |  |  |  | 4.61% |  |  |  |  |  |  |
Lease liabilities |  |  |  |  |  |  |  |  |  |  |
Loans and borrowings |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  | € 5,628 | 7,726 | 7,943 |  |  |  |  |
Lease liabilities |  |  |  | € 5,628 |  |  |  |  |  |  |
Lease liabilities | Fixed interest rate | Weighted average |  |  |  |  |  |  |  |  |  |  |
Loans and borrowings |  |  |  |  |  |  |  |  |  |  |
Interest rate percentage |  |  |  | 1.00% |  |  |  |  |  |  |
Related party loan |  |  |  |  |  |  |  |  |  |  |
Loans and borrowings |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  | € 400 |  |  |  |  |  |  |
Interest rate percentage |  |  |  | 4.23% |  |  |  |  |  |  |
Borrowings |  |  |  |  | 30 | 64 |  |  |  |  |
Interest expense on borrowings |  |  |  | € 1 | 2 | 3 |  |  |  |  |
Amount outstanding |  |  |  | € 0 | € 30 | € 64 |  |  |  |  |
Miscellaneous investment loans |  |  |  |  |  |  |  |  |  |  |
Loans and borrowings |  |  |  |  |  |  |  |  |  |  |
Reimbursable term |  |  |  | 7 years |  |  |  |  |  |  |
Borrowings |  |  |  | € 711 |  |  |  |  |  |  |
Miscellaneous investment loans | Fixed interest rate | Weighted average |  |  |  |  |  |  |  |  |  |  |
Loans and borrowings |  |  |  |  |  |  |  |  |  |  |
Interest rate percentage |  |  |  | 1.00% |  |  |  |  |  |  |

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