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Transactions in Foreign Currency (Tables)
 12 Months Ended
Dec. 31, 2021
Disclosure About The Transactions In Foreign Currency [Abstract]  
Schedule of assets and liabilities
   2021   2020 
   US$(000)   US$(000) 
         
Assets        
Cash and cash equivalents   51,343    15,356 
Advances to suppliers for work in progress   9,210    4,242 
Trade and other receivables   4,946    4,587 
    65,499    24,185 
Liabilities          
Trade and other payables   (10,356)   (11,314)
Interest-bearing loans and borrowings   (149,612)   (149,612)
    (159,968)   (160,926)
Cross currency swap position   132,000    150,000 
Net monetary position    37,531    13,259