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Equity Based Compensation - Schedule of Stock Based Compensation (Details) - EUR (€) € in Thousands | 12 Months Ended
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Dec. 31, 2025 | Dec. 05, 2025 | Dec. 31, 2024 | Dec. 05, 2024 | Dec. 31, 2023 | Dec. 05, 2023
Schedule of Stock Based Compensation [Line Items] |  |  |  |  |  |
Total | € 269,125 | € 269,125 | € 961 | € 961 | € 388 | € 388
Equity based compensation for strategic advisors [Member] |  |  |  |  |  |
Schedule of Stock Based Compensation [Line Items] |  |  |  |  |  |
Total |  | 261,389 |  |  |  |
Equity based compensation for other parties [Member] |  |  |  |  |  |
Schedule of Stock Based Compensation [Line Items] |  |  |  |  |  |
Total |  | 3,228 |  |  |  |
Restricted stock units, share options and restricted stock awards [Member] |  |  |  |  |  |
Schedule of Stock Based Compensation [Line Items] |  |  |  |  |  |
Total | € 4,508 | 4,508 | € 961 | 961 | € 190 | 190
Warrant expenses [Member] |  |  |  |  |  |
Schedule of Stock Based Compensation [Line Items] |  |  |  |  |  |
Total |  |  |  |  |  | € 198

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