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Fair values (Tables)
 12 Months Ended
Dec. 31, 2021
Disclosure of fair value measurement of assets [abstract]  
Fair values measurement
    Carrying amount  Fair value
December 31, 2021      Level 1  Level 2  Level 3  Total
    Financial assets            
Financial assets measured at fair value                
Derivative financial instruments   417  —   417  —   417
    417            
                 
    Financial liabilities            
Financial liabilities measured at fair value                
Derivative financial instruments   92  —   92  —   92
    92            
Financial liabilities not measured at fair value                
Long-term borrowings   31,750  —   32,155  —   32,155
    31,750            

 

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