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Company Information - Bonus share award plans ("AGA") (Details)				12 Months Ended
	Dec. 14, 2020 EUR (€) € / shares	Jun. 28, 2020 EUR (€) € / shares	Jan. 26, 2020 EUR (€) € / shares	Dec. 31, 2020 EUR (€) € / shares	Dec. 31, 2019 EUR (€)	Dec. 31, 2018 EUR (€)
Disclosure of terms and conditions of share-based payment arrangement [line items]
Number of bonus shares granted					10,000
Number of bonus shares fully vested					27,400
Capital increase arising from the vesting of bonus share awards | €				€ 938,000	€ 1,407,000	€ 833,000
Par value per share | € / shares				€ 0.01
AGA
Disclosure of terms and conditions of share-based payment arrangement [line items]
Number of bonus shares fully vested				517,550
AGA 2018-2
Disclosure of terms and conditions of share-based payment arrangement [line items]
Number of bonus shares granted				65,700		65,700
Vesting period				2 years
Number of bonus shares fully vested			63,300	63,300
Capital increase arising from the vesting of bonus share awards | €			€ 633,000
Par value per share | € / shares			€ 0.01
AGA 2019-2
Disclosure of terms and conditions of share-based payment arrangement [line items]
Number of bonus shares granted				246,000	246,000
Vesting period				1 year
Number of bonus shares fully vested		227,000		227,000
Capital increase arising from the vesting of bonus share awards | €		€ 2,270
Par value per share | € / shares		€ 0.01
AGA 2018-3
Disclosure of terms and conditions of share-based payment arrangement [line items]
Number of bonus shares granted				265,700		265,700
Vesting period				2 years
Number of bonus shares fully vested	227,250			227,250
Capital increase arising from the vesting of bonus share awards | €	€ 2,272,500.0
Par value per share | € / shares	€ 0.01

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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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The increase (decrease) in equity resulting from share-based payment transactions. [Refer: Equity]

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-IssueDate 2020-01-01
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The number of other equity instruments (ie other than share options) granted in a share-based payment arrangement.

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The number of other equity instruments (ie other than share options) exercised or vested in a share-based payment arrangement.

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The nominal value per share.

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Period which the right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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