| Cover Page | Aug. 11, 2021 |
| Document Information [Line Items] | |
| Document Type | 8-K |
| Document Period End Date | Mar. 11, 2022 |
| Entity Registrant Name | Spark Networks SE |
| Entity Central Index Key | 0001705338 |
| Amendment Flag | false |
| Entity Incorporation, State or Country Code | 2M |
| Entity File Number | 001-38252 |
| Entity Address, Address Line One | Kohlfurter Straße 41/43 |
| Entity Address, City or Town | Berlin |
| Entity Address, Country | DE |
| Entity Address, Postal Zip Code | 10999 |
| Country Region | +49 |
| City Area Code | 30 |
| Local Phone Number | 868000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
| Common Stock | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Ordinary shares, €1.00 nominal value per share* |
| American Depositary Share, ADS | |
| Document Information [Line Items] | |
| Title of 12(b) Security | American Depository Shares each representing one-tenth of an ordinary share |
| Trading Symbol | LOV |
| Security Exchange Name | NASDAQ |
