Consolidated statement of changes in shareholdersʼ equity
| 
       in CHF thousands  | 
    
       
  | 
    
       Share capital  | 
    
       
  | 
    
       Capital reserves  | 
    
       
  | 
    
       Treasury shares  | 
    
       
  | 
    
       Retained earnings  | 
    
       
  | 
    
       Total equity  | 
  
| 
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
  
| 
       Balance as of 31.03.2021  | 
    
       
  | 
    
       74 656  | 
    
       
  | 
    
       160 607  | 
    
       
  | 
    
       –63  | 
    
       
  | 
    
       –101 477  | 
    
       
  | 
    
       133 723  | 
  
| 
       Earnings  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       2 020  | 
    
       
  | 
    
       2 020  | 
  
| 
       Other comprehensive income  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       27  | 
    
       
  | 
    
       27  | 
  
| 
       Total comprehensive income  | 
    
       
  | 
    
       0  | 
    
       
  | 
    
       0  | 
    
       
  | 
    
       0  | 
    
       
  | 
    
       2 047  | 
    
       
  | 
    
       2 047  | 
  
| 
       Purchase / Sale of treasury shares  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       0  | 
    
       
  | 
    
       0  | 
    
       
  | 
    
       0  | 
  
| 
       Distribution from capital reserves  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       –3 316  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       –3 316  | 
  
| 
       Balance as of 30.09.2021  | 
    
       
  | 
    
       74 656  | 
    
       
  | 
    
       157 291  | 
    
       
  | 
    
       –63  | 
    
       
  | 
    
       –99 430  | 
    
       
  | 
    
       132 454  | 
  
| 
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
  
| 
       Earnings  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       3 951  | 
    
       
  | 
    
       3 951  | 
  
| 
       Other comprehensive income  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       98  | 
    
       
  | 
    
       98  | 
  
| 
       Total comprehensive income  | 
    
       
  | 
    
       0  | 
    
       
  | 
    
       0  | 
    
       
  | 
    
       0  | 
    
       
  | 
    
       4 049  | 
    
       
  | 
    
       4 049  | 
  
| 
       Purchase / Sale of treasury shares  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       0  | 
    
       
  | 
    
       0  | 
  
| 
       Balance as of 31.03.2022  | 
    
       
  | 
    
       74 656  | 
    
       
  | 
    
       157 291  | 
    
       
  | 
    
       –63  | 
    
       
  | 
    
       –95 381  | 
    
       
  | 
    
       136 503  | 
  
| 
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
  
| 
       Earnings  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       3 370  | 
    
       
  | 
    
       3 370  | 
  
| 
       Other comprehensive income  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       28  | 
    
       
  | 
    
       28  | 
  
| 
       Total comprehensive income  | 
    
       
  | 
    
       0  | 
    
       
  | 
    
       0  | 
    
       
  | 
    
       0  | 
    
       
  | 
    
       3 398  | 
    
       
  | 
    
       3 398  | 
  
| 
       Distribution from capital reserves  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       –3 316  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       –3 316  | 
  
| 
       Balance as of 30.09.2022  | 
    
       
  | 
    
       74 656  | 
    
       
  | 
    
       153 975  | 
    
       
  | 
    
       –63  | 
    
       
  | 
    
       –91 983  | 
    
       
  | 
    
       136 585  | 
  
Information contained in the notes to the semi-annual financial statements is an integral part of the consolidated semi-annual financial statements.