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Equity (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of classes of share capital [abstract]  
Disclosure Of Additional Paid in Capital [Table Text Block]
Balance of additional paid-in capital as of January 1, 2017, December 31, 2017 and 2018 were as follows:
 
 
 
January 1,
2017
 
 
December 31,

2017
 
 
December 31,
2018
 
 
 
(in thousands)
 
From ordinary shares
 
$
93,341
 
 
 
93,341
 
 
 
93,341
 
From treasury shares
 
 
4,041
 
 
 
4,784
 
 
 
5,080
 
From share-based compensation
 
 
6,091
 
 
 
6,151
 
 
 
6,182
 
From share of changes in equities of associates
 
 
-
 
 
 
151
 
 
 
146
 
 
 
$
103,473
 
 
 
104,427
 
 
 
104,749
 
Disclosure Of Accumulated Other Comprehensive Income [Table Text Block]
Changes in accumulated other comprehensive income, net of tax, are as follows:
 
 
 
Foreign

currency

translation
 
 
Unrealized

gains

(losses) on

securities
 
 
Defined

benefit

pension

plans
 
 
Accumulated

other

comprehensive

income
 
 
 
(in thousands)
 
Beginning balance, January 1, 2017
 
$
(279
)
 
 
(350
)
 
 
(925
)
 
 
(1,554
)
Exchange differences arising on translation of foreign operations
 
 
862
 
 
 
-
 
 
 
-
 
 
 
862
 
Changes in fair value of financial assets
 
 
-
 
 
 
313
 
 
 
-
 
 
 
313
 
Remeasurement of defined benefit pension plans
 
 
-
 
 
 
-
 
 
 
(67
)
 
 
(67
)
Ending balance, December 31, 2017
 
 
583
 
 
 
(37
)
 
 
(992
)
 
 
(446
)
Exchange differences arising on translation of foreign operations
 
 
(334
)
 
 
-
 
 
 
-
 
 
 
(334
)
Changes in fair value of financial assets
 
 
-
 
 
 
(869
)
 
 
-
 
 
 
(869
)
Remeasurement of defined benefit pension plans
 
 
-
 
 
 
-
 
 
 
1,100
 
 
 
1,100
 
Ending balance, December 31, 2018
 
$
249
 
 
 
(906
)
 
 
108
 
 
 
(549
)
Non controlling Interest [Table Text Block]
 
(e)
Noncontrolling interest
 
 
 
Year ended December 31,
 
 
 
2017
 
 
2018
 
 
 
(in thousands)
 
Balance at the beginning of year
 
$
418
 
 
 
(1,735
)
Equity attributable to non-controlling interests
 
 
 
 
 
 
 
 
Loss for the year
 
 
(2,142
)
 
 
(2,543
)
Changes in fair value of financial assets
 
 
9
 
 
 
(26
)
Remeasurement of defined benefit pension plans
 
 
(14
)
 
 
33
 
Share-based compensation expenses
 
 
52
 
 
 
22
 
New shares issued by subsidiary
 
 
(25
)
 
 
(10
)
Exchange differences arising on translation of foreign operations
 
 
-
 
 
 
(2
)
Purchase of subsidiary shares from noncontrolling interests
 
 
(33
)
 
 
-
 
Balance at the end of year
 
$
(1,735
)
 
 
(4,261
)