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Consolidated Statements of Profit or Loss and Other Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement Line Items [Line Items]      
Revenue $ 100,002 $ 75,826 $ 68,399
Less: Royalty (5,007) (3,854) (3,426)
Production costs (43,711) (36,400) (39,315)
Depreciation (4,628) (4,434) (4,071)
Gross profit 46,656 31,138 21,587
Other income 4,765 2,274 7,101
Other expenses (5,315) (666) (336)
Administrative expenses (7,997) (5,637) (6,465)
Cash-settled share-based expense (1,413) (689) (315)
Equity-settled share-based expense (14)
Net foreign exchange gain 4,305 29,661 223
Profit on sale of subsidiary 5,409
Fair value losses on derivative assets (266) (601) (360)
Operating profit 40,735 60,889 21,421
Finance income 62 146 53
Finance cost (367) (344) (273)
Profit before tax 40,430 60,691 21,201
Tax expense (15,173) (10,290) (7,445)
Profit for the year 25,257 50,401 13,756
Other comprehensive income      
Exchange differences on translation of foreign operations (173) 49 (676)
Reclassification of accumulated exchange differences on the sale of subsidiary (2,109)
Total comprehensive income for the year 25,084 48,341 13,080
Profit attributable to:      
Owners of the Company 20,780 42,018 10,766
Non-controlling interests 4,477 8,383 2,990
Profit for the year 25,257 50,401 13,756
Total comprehensive income attributable to:      
Owners of the Company 20,607 39,958 10,090
Non-controlling interests 4,477 8,383 2,990
Total comprehensive income for the year $ 25,084 $ 48,341 $ 13,080
Earnings per share      
Basic earnings per share ($) (in dollars per share) $ 1.73 $ 3.82 $ 0.99
Diluted earnings per share ($) (in dollars per share) $ 1.73 $ 3.81 $ 0.99