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Financial - risk management objectives and policies - Effect in profit or loss of the variations of interest rates (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Financial - risk management objectives and policies      
Increase in libor interest rate 10.00% 10.00% 10.00%
Decrease in libor interest rate (10.00%) (10.00%) (10.00%)
Libor interest rate increased effect on income $ (1,414) $ (81) $ (306)
Libor interest rate decreased effect on income $ 1,414 $ 81 $ 306