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Fair values (Tables)
 6 Months Ended
Jun. 30, 2021
Disclosure of fair value measurement of assets [abstract]  
Fair values - Fair value measurement
Fair value
June 30, 2021   Carrying amount   Level 1   Level 2   Level 3   Total
    Other financial assets                
Financial assets measured at fair value                    
Derivative financial instruments   111   —   111   —   111
    111                
                     
  Other financial liabilities                 
Financial liabilities measured at fair value                    
Derivative financial instruments   176    —   176    —   176 
    176                
Financial liabilities not measured at fair value                    
Long-term borrowings   34,250   —   34,430   —   34,430
    34,250                

  

    Fair value
December 31, 2020   Carrying amount   Level 1   Level 2   Level 3   Total
    Other financial liabilities                
Financial liabilities not measured at fair value                    
Long-term borrowings   37,000   —   37,961   —   37,961
    37,000                

 
Fair values - Valuation techniques and significant unobservable inputs

 

 

Financial instruments measured at fair value              
Type   Valuation Techniques   Significant unobservable inputs
               
         
Derivative financial instruments:        
Interest Rate Swap   Discounted cash flow     Discount rate
               

 

Financial instruments not measured at fair value

              
               
Asset and liabilities not measured at fair value              
               
Type   Valuation Techniques   Significant unobservable inputs
               
Long-term borrowings   Discounted cash flow   Discount rate