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Related party transactions (Details) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Related party transactions (Details) [Line Items]      
Property plant and equipment   € 774  
Administration fees € 3,412 2,963 € 2,143
Management fees 0 450 450
Development costs 1,095    
Interest expense 0 338 261
Interest loan expense from other shareholder 0 1,625 1,070
ads-tec Engineering GmbH [Member]      
Related party transactions (Details) [Line Items]      
Development costs   1,479 € 262
ads-tec Industrial IT GmbH [Member]      
Related party transactions (Details) [Line Items]      
Comprise liability 1,167 12  
ads-tec Administration GmbH [Member]      
Related party transactions (Details) [Line Items]      
Comprise liability 476 838  
ads-tec Dresden GmbH [Member]      
Related party transactions (Details) [Line Items]      
Comprise liability € 28 € 1,199