Cash and cash equivalents -Summary of Cash and Cash Equivalents (Detail) - EUR (€)	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Cash and cash equivalents [abstract]
Cash and cash equivalents	€ 291,678,888	€ 280,728,037	€ 391,231,637	€ 161,837,429

The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents]

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