| 
       in CHF 1 000  | 
    
       Notes  | 
    
       2024  | 
    
       2023 restated 1)  | 
  
| 
       Net profit  | 
    
       
  | 
    
       27 253  | 
    
       11 760  | 
  
| 
       Depreciation  | 
    
       12 476  | 
    
       11 686  | 
  |
| 
       Impairment  | 
    
       486  | 
    
       -  | 
  |
| 
       Amortization  | 
    
       7 305  | 
    
       4 404  | 
  |
| 
       Interest income  | 
    
       –592  | 
    
       –571  | 
  |
| 
       Interest expenses  | 
    
       4 214  | 
    
       4 610  | 
  |
| 
       Tax expenses  | 
    
       8 252  | 
    
       8 923  | 
  |
| 
       Change in provisions  | 
    
       
  | 
    
       –190  | 
    
       –483  | 
  
| 
       Change in other non-current assets  | 
    
       
  | 
    
       24  | 
    
       -  | 
  
| 
       Other non-cash-items  | 
    
       
  | 
    
       603  | 
    
       3 460  | 
  
| 
       Subtotal before working capital changes  | 
    
       
  | 
    
       59 831  | 
    
       43 789  | 
  
| 
       Change in inventories  | 
    
       
  | 
    
       25 355  | 
    
       –7 198  | 
  
| 
       Change in trade accounts receivable  | 
    
       
  | 
    
       –4 937  | 
    
       1 033  | 
  
| 
       Change in other current assets  | 
    
       
  | 
    
       –1 241  | 
    
       –4 007  | 
  
| 
       Change in trade accounts payable  | 
    
       
  | 
    
       8 351  | 
    
       –2 684  | 
  
| 
       Change in other current liabilities  | 
    
       
  | 
    
       –600  | 
    
       15 213  | 
  
| 
       Change in working capital  | 
    
       
  | 
    
       26 928  | 
    
       2 357  | 
  
| 
       Income tax paid  | 
    
       
  | 
    
       –8 690  | 
    
       –4 269  | 
  
| 
       Interest paid  | 
    
       
  | 
    
       –3 894  | 
    
       –3 688  | 
  
| 
       Interest received  | 
    
       
  | 
    
       586  | 
    
       568  | 
  
| 
       Net cash (used in) / from operating activities  | 
    
       
  | 
    
       74 761  | 
    
       38 757  | 
  
| 
       Purchase of property, plant and equipment  | 
    
       
  | 
    
       –13 068  | 
    
       –12 359  | 
  
| 
       Proceeds from sale of property, plant and equipment  | 
    
       
  | 
    
       259  | 
    
       203  | 
  
| 
       Purchase of intangible assets  | 
    
       –858  | 
    
       –347  | 
  |
| 
       Acquisition of subsidiaries, net of cash acquired  | 
    
       –54 812  | 
    
       –21 985  | 
  |
| 
       Net cash used in investing activities  | 
    
       
  | 
    
       –68 479  | 
    
       –34 488  | 
  
| 
       Transaction costs on conversion of MCNs  | 
    
       
  | 
    
       –748  | 
    
       -  | 
  
| 
       Purchase of treasury shares (net)  | 
    
       
  | 
    
       –3 236  | 
    
       –340  | 
  
| 
       Repayment of finance lease liabilities  | 
    
       
  | 
    
       –227  | 
    
       –318  | 
  
| 
       Proceeds from borrowings short-term  | 
    
       
  | 
    
       10 096  | 
    
       1 301  | 
  
| 
       Proceeds from borrowings long term  | 
    
       
  | 
    
       42 190  | 
    
       14 986  | 
  
| 
       Repayment of borrowings short-term  | 
    
       
  | 
    
       –29 144  | 
    
       –36 207  | 
  
| 
       Repayment of borrowings long-term  | 
    
       
  | 
    
       –10 000  | 
    
       -  | 
  
| 
       Net cash from financing activities  | 
    
       
  | 
    
       8 931  | 
    
       –20 578  | 
  
| 
       Currency translation effects  | 
    
       
  | 
    
       1 095  | 
    
       –1 331  | 
  
| 
       Net increase in cash and cash equivalents  | 
    
       
  | 
    
       16 308  | 
    
       –17 640  | 
  
| 
       Cash and cash equivalents at the beginning of the period  | 
    
       57 851  | 
    
       75 491  | 
  |
| 
       Cash and cash equivalents at the end of the period  | 
    
       74 159  | 
    
       57 851  | 
  
1) Refer to note "2.2.1 Change to the Consolidation and Valuation Principles - Accounting for Goodwill".