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Other Information - Executive Compensation (Details) - EUR (€) | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Chairman |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
Total | € 1,923,100 | € 1,923,100 | € 1,923,100 | € 1,923,100 | € 1,923,100 | € 1,923,100 | € 1,923,100 | € 1,923,100
Board of Directors | Chairman |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
Total | 240,000 |  |  |  |  |  |  |
Board of Directors | Vice chairman |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
Total | 200,000 |  |  |  |  |  |  |
Board of Directors | Executive Member |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
Total | 0 |  |  |  |  |  |  |
Board of Directors | Proprietary Member |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
Total | 120,000 |  |  |  |  |  |  |
Board of Directors | Independent Member |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
Total | 120,000 |  |  |  |  |  |  |
Board of Directors | Other external |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
Total | 120,000 |  |  |  |  |  |  |
Executive Commission | Chairman |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
Total | 80,000 |  |  |  |  |  |  |
Executive Commission | Vice chairman |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
Total | 80,000 |  |  |  |  |  |  |
Executive Commission | Executive Member |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
Total | 0 |  |  |  |  |  |  |
Executive Commission | Proprietary Member |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
Total | 80,000 |  |  |  |  |  |  |
Executive Commission | Independent Member |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
Total | 80,000 |  |  |  |  |  |  |
Executive Commission | Other external |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
Total | 80,000 |  |  |  |  |  |  |
Advisory or control committees | Chairman |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
Total | 22,400 |  |  |  |  |  |  |
Advisory or control committees | Vice chairman |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
Total | 0 |  |  |  |  |  |  |
Advisory or control committees | Executive Member |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
Total | 0 |  |  |  |  |  |  |
Advisory or control committees | Proprietary Member |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
Total | 11,200 |  |  |  |  |  |  |
Advisory or control committees | Independent Member |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
Total | 11,200 |  |  |  |  |  |  |
Advisory or control committees | Other external |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
Total | 11,200 |  |  |  |  |  |  |
Allowances | € 1,000 |  |  |  |  |  |  |

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