Statement Of Changes In Equity [Abstract]

Alfen N.V. - Filing #1842354

Concept	As at 2021-12-31	As at 2021-12-31	As at 2021-12-31	2021-01-01 to 2021-12-31	As at 2021-12-31	As at 2021-12-31	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	2020-01-01 to 2020-12-31	As at 2020-12-31	As at 2020-12-31	2020-01-01 to 2020-12-31	As at 2020-12-31	As at 2020-12-31	2020-01-01 to 2020-12-31	As at 2020-12-31	2020-01-01 to 2020-12-31	2020-01-01 to 2020-12-31	As at 2019-12-31	As at 2019-12-31	As at 2019-12-31	As at 2019-12-31	As at 2019-12-31
Statement of changes in equity [abstract]
Statement of changes in equity [line items]
Equity	22,265,000 EUR	96,319,000 EUR	21,450,000 EUR	—	50,429,000 EUR	2,175,000 EUR	—	—	—	9,637,000 EUR	2,175,000 EUR	—	11,987,000 EUR	50,429,000 EUR	—	74,228,000 EUR	—	—	1,913,000 EUR	13,048,000 EUR	3,510,000 EUR	2,000,000 EUR	5,625,000 EUR
Changes in equity [abstract]
Comprehensive income [abstract]
Profit (loss)	—	—	—	21,450,000 EUR	—	—	21,450,000 EUR	—	11,987,000 EUR	—	—	—	—	—	—	—	11,987,000 EUR	—	—	—	—	—	—
Other comprehensive income	—	—	—	—	—	—	— EUR	—	— EUR	—	—	—	—	—	—	—	—	—	—	—	—	—	—
Comprehensive income	—	—	—	21,450,000 EUR	—	—	21,450,000 EUR	—	11,987,000 EUR	—	—	—	—	—	—	—	11,987,000 EUR	—	—	—	—	—	—
Issue of equity	—	—	—	—	—	—	— EUR	—	49,706,000 EUR	—	—	—	—	—	175,000 EUR	—	—	49,531,000 EUR	—	—	—	—	—
Dividends recognised as distributions to owners	—	—	—	—	—	—	— EUR	—	— EUR	—	—	—	—	—	—	—	—	—	—	—	—	—	—
Increase (decrease) through share-based payment transactions, equity	—	—	—	—	—	—	641,000 EUR	641,000 EUR	502,000 EUR	—	—	502,000 EUR	—	—	—	—	—	—	—	—	—	—	—