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Income Taxes (Details 1) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Expense Benefit [Line Items]      
Earnings before income taxes $ 30,338 $ 59,418 $ 32,867
Taiwan operations [Member]      
Income Tax Expense Benefit [Line Items]      
Earnings before income taxes 10,333 63,347 28,349
Cayman operations [Member]      
Income Tax Expense Benefit [Line Items]      
Earnings before income taxes (2,843) (4,569) 4,363
US operations [Member]      
Income Tax Expense Benefit [Line Items]      
Earnings before income taxes (947) (842) (719)
China operations [Member]      
Income Tax Expense Benefit [Line Items]      
Earnings before income taxes 659 1,336 825
Korea operations [Member]      
Income Tax Expense Benefit [Line Items]      
Earnings before income taxes 179 124 33
Japan operations [Member]      
Income Tax Expense Benefit [Line Items]      
Earnings before income taxes 19 22 16
Samoa operations [Member]      
Income Tax Expense Benefit [Line Items]      
Earnings before income taxes $ 22,938 $ 0 $ 0