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Financial assets at fair value through other comprehensive income (Details) - CHF (SFr)
1 Months Ended
Jun. 30, 2025
Dec. 31, 2025
Financial assets at fair value through other comprehensive income    
Financial assets at fair value through other comprehensive income   SFr 285,962
Stalicla SA    
Financial assets at fair value through other comprehensive income    
Investment in Stalicla SA SFr 795,029  
Preferred shares received on investment in Stalicla SA 23,342  
Financial assets at fair value through other comprehensive income SFr 285,962 SFr 285,962