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Consolidated Statements of Changes in Equity - USD ($)
shares in Thousands, $ in Thousands
Ordinary shares [member]
Additional paid-in capital [member]
Treasury shares [member]
Accumulated other Comprehensive income [member]
Retained earnings [member]
Noncontrolling interests [member]
Equity attributable to owners of parent [member]
Total
Balance at Dec. 31, 2017 $ 107,010 $ 104,427 $ (8,878) $ (446) $ 253,210 $ (1,735) $ 455,323 $ 453,588
Balance (in shares) at Dec. 31, 2017 356,700   (12,492)          
IFRS Statement [Line Items]                
Effect of adopting IFRS 9       (193) 193      
Profit (loss) for the year         8,569 (2,543) 8,569 6,026
Other comprehensive income       90   5 90 95
Total comprehensive income for the year       (103) 8,762 (2,538) 8,659 6,121
Contributions by and distributions to owners                
Declaration of cash dividends         (17,210)   (17,210) (17,210)
Share-based compensation expenses   386       22 386 408
Restricted stock vested (in shares)     83          
Restricted stock vested   (59) $ 59          
Aggregate of contribution by distribution to owners (in shares)     83          
Aggregate of contribution by distribution to owners   327 $ 59   (17,210) 22 (16,824) (16,802)
Changes in ownership interests                
New shares issued by subsidiary   21       (10) 21 11
Dilution gain of equity method investment   (26)     (605)   (631) (631)
Transfer of financial liability to noncontrolling interests               0
Aggregate of Changes in Ownership Interests   (5)     (605) (10) (610) (620)
Balance at Dec. 31, 2018 $ 107,010 104,749 $ (8,819) (549) 244,157 (4,261) 446,548 442,287
Balance (in shares) at Dec. 31, 2018 356,700   (12,409)          
IFRS Statement [Line Items]                
Profit (loss) for the year         (13,614) (2,570) (13,614) (16,184)
Other comprehensive income       (403)   12 (403) (391)
Total comprehensive income for the year       (403) (13,614) (2,558) (14,017) (16,575)
Contributions by and distributions to owners                
Share-based compensation expenses   452       5 452 457
Restricted stock vested (in shares)     77          
Restricted stock vested   (55) $ 55          
Aggregate of contribution by distribution to owners (in shares)     77          
Aggregate of contribution by distribution to owners   397 $ 55     5 452 457
Changes in ownership interests                
Dilution gain of equity method investment   4         4 4
Transfer of financial liability to noncontrolling interests           5,071   5,071
Aggregate of Changes in Ownership Interests   4       5,071 4 5,075
Balance at Dec. 31, 2019 $ 107,010 105,150 $ (8,764) (952) 230,543 (1,743) 432,987 431,244
Balance (in shares) at Dec. 31, 2019 356,700   (12,332)          
IFRS Statement [Line Items]                
Profit (loss) for the year         47,134 (1,974) 47,134 45,160
Other comprehensive income       404   41 404 445
Total comprehensive income for the year       404 47,134 (1,933) 47,538 45,605
Contributions by and distributions to owners                
Share-based compensation expenses   755       8 755 763
Restricted stock vested (in shares)     16          
Restricted stock vested   (11) $ 11          
Employee stock options exercised (in shares)     3,150          
Employee stock options exercised   1,408 $ 2,237       3,645 3,645
Aggregate of contribution by distribution to owners (in shares)     3,166          
Aggregate of contribution by distribution to owners   2,152 $ 2,248     8 4,400 4,408
Changes in ownership interests                
New shares issued by subsidiary   (34)     (4,740) 8,695 (4,774) 3,921
Dilution gain of equity method investment   25         25 25
Transfer of financial liability to noncontrolling interests               0
Declaration of cash dividends by subsidiary           (4)   (4)
Aggregate of Changes in Ownership Interests   (9)     (4,740) 8,691 (4,749) 3,942
Balance at Dec. 31, 2020 $ 107,010 $ 107,293 $ (6,516) $ (548) $ 272,937 $ 5,023 $ 480,176 $ 485,199
Balance (in shares) at Dec. 31, 2020 356,700   (9,166)