Income taxes - Taxes recognized through profit or loss (Details) - EUR (€) € in Thousands	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income taxes
Current tax expenses	€ 85	€ (152)	€ (72)
Current year	(41)	(144)	(56)
Adjustments for prior periods	126	(8)	(16)
Deferred tax (expense)/income	(372)	45	142
Temporary differences	(372)	45	142
Income tax (expenses)/ benefit	(287)	(107)	70
Income taxes recognized directly in other comprehensive income	€ 0	€ 0	€ 0

Adjustments of tax expense (income) recognised in the period for current tax of prior periods.

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The amount of income taxes payable (recoverable) in respect of the taxable profit (tax loss) for a period.

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The amount of current tax expense (income) and adjustments for the current tax of prior periods. [Refer: Current tax expense (income); Adjustments for current tax of prior periods]

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The amount of tax expense or income relating to changes in deferred tax liabilities and deferred tax assets, recognised in profit or loss. [Refer: Deferred tax assets; Deferred tax expense (income); Deferred tax liabilities]

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The amount of deferred tax expense or income relating to the creation or reversal of temporary differences. [Refer: Temporary differences [member]; Deferred tax expense (income)]

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The aggregate amount included in the determination of profit (loss) for the period in respect of current tax and deferred tax. [Refer: Current tax expense (income); Deferred tax expense (income)]

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The amount of income tax relating to amounts recognised in other comprehensive income. [Refer: Other comprehensive income]

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