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Investment in associate company (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Investment in associate company [Abstract]      
Investment in associate company $ 4,772 $ 4,388  
Details of Associates [Abstract]      
Name of associate Goodwood Ship Management Pte. Ltd.    
Principal activities Ship management    
Place of incorporation and business Singapore    
Effective equity interest 50.00% 50.00%  
Share of Profit of the Associate Using in Equity Method [Abstract]      
Profit after taxation $ 852 $ 858 $ 802
Other comprehensive income for the year, net of tax 44 (53)  
Total comprehensive income for the year $ 896 $ 805