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Share-based payments (Details 1)
6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Statement [Line Items]    
Outstanding,Beginning 148,433 148,433
Exercised 0 0
Outstanding,Ending 148,433 148,433
Thereof vested 148,433 148,433
Option 2016 Member    
Statement [Line Items]    
Outstanding,Beginning 888,632 1,094,852
Exercised 0 202,020
Outstanding,Ending 888,632 892,832
Thereof vested 888,632 892,832