Income Taxes (Details 1) - EUR (€)	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021
Loss before provision	€ 4,806	€ 4,730
Switzerland
Loss before provision	382	438
The Netherlands
Loss before provision	1,045	1,043
United States
Loss before provision	€ 3,379	€ 3,249

Amount of expense related to other loss.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(5))
-URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(14))
-URI https://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260

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