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Investment securities (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Security Owned Not Readily Marketable [Line Items] |  |
Cost Method Investments | $ 21,877 | $ 12,688
Chi Lin Optoelectronics Co Ltd [Member] |  |
Security Owned Not Readily Marketable [Line Items] |  |
Cost Method Investments | 625 | 625
Chi Lin Technology Co Ltd [Member] |  |
Security Owned Not Readily Marketable [Line Items] |  |
Cost Method Investments | 432 | 432
Jetronics International Corp [Member] |  |
Security Owned Not Readily Marketable [Line Items] |  |
Cost Method Investments | 1,600 | 1,600
C Company [Member] |  |
Security Owned Not Readily Marketable [Line Items] |  |
Cost Method Investments | 8,962 | 8,962
S Company [Member] |  |
Security Owned Not Readily Marketable [Line Items] |  |
Cost Method Investments | 5,189 | 0
L Company [Member] |  |
Security Owned Not Readily Marketable [Line Items] |  |
Cost Method Investments | 4,000 | 0
eTurboTouch Technology Inc [Member] |  |
Security Owned Not Readily Marketable [Line Items] |  |
Cost Method Investments | 477 | 477
Oculon Optoelectronics Inc [Member] |  |
Security Owned Not Readily Marketable [Line Items] |  |
Cost Method Investments | 309 | 309
Shinyoptics Corp [Member] |  |
Security Owned Not Readily Marketable [Line Items] |  |
Cost Method Investments | $ 283 | $ 283

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