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Fair values measurement (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Disclosure of fair value measurement of assets [line items]    
Non-current portion of fair value of derivative financial instruments $ 495 $ 1,315
Current portion of fair value of derivative financial instruments 808 1,092
Financial liabilities 66,340 63,448
At fair value [member] | Financial liabilities not measured at fair value [member]    
Disclosure of fair value measurement of assets [line items]    
Long-term borrowings 54,107 45,549
At fair value [member] | Level 2 [member] | Financial liabilities not measured at fair value [member]    
Disclosure of fair value measurement of assets [line items]    
Long-term borrowings 54,107 45,549
Financial liabilities not measured at fair value [member]    
Disclosure of fair value measurement of assets [line items]    
Long-term borrowings 52,620 44,375
Financial liabilities 52,620 44,375
Financial assets measured at fair value [member]    
Disclosure of fair value measurement of assets [line items]    
Non-current portion of fair value of derivative financial instruments 495 1,315
Current portion of fair value of derivative financial instruments 808 1,092
Financial assets, at fair value 1,303 2,407
Financial assets measured at fair value [member] | At fair value [member]    
Disclosure of fair value measurement of assets [line items]    
Non-current portion of fair value of derivative financial instruments 495 1,315
Current portion of fair value of derivative financial instruments 808 1,092
Financial assets measured at fair value [member] | At fair value [member] | Level 1 [member]    
Disclosure of fair value measurement of assets [line items]    
Non-current portion of fair value of derivative financial instruments 0 0
Current portion of fair value of derivative financial instruments 0 0
Financial assets measured at fair value [member] | At fair value [member] | Level 2 [member]    
Disclosure of fair value measurement of assets [line items]    
Non-current portion of fair value of derivative financial instruments 495 1,315
Current portion of fair value of derivative financial instruments 808 1,092
Financial assets measured at fair value [member] | At fair value [member] | Level 3 [member]    
Disclosure of fair value measurement of assets [line items]    
Non-current portion of fair value of derivative financial instruments 0 0
Current portion of fair value of derivative financial instruments 0 0
Financial liabilities not measured at fair value [member] | At fair value [member] | Level 1 [member]    
Disclosure of fair value measurement of assets [line items]    
Long-term borrowings 0 0
Financial liabilities not measured at fair value [member] | At fair value [member] | Level 3 [member]    
Disclosure of fair value measurement of assets [line items]    
Long-term borrowings $ 0 $ 0