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Investment securities, including securities measured at fair value (Tables)
 12 Months Ended
Dec. 31, 2012
Investments, All Other Investments [Abstract]  
Schedule of Cost Method Investments [Table Text Block]

Following is a summary of such investments which are accounted for using the cost method as of December 31, 2011 and 2012:

 

  December 31, 
  2011  2012 
  (in thousands) 
       
Chi Lin Optoelectronics Co., Ltd. $625   625 
Chi Lin Technology Co. Ltd.  432   432 
Jetronics International Corp.  1,600   1,600 
C Company  8,962   8,962 
Spatial Photonics, Inc.  6,500   - 
eTurboTouch Technology Inc.  715   477 
Oculon Optoelectronics Inc.  309   309 
Shinyoptics Corp.  283   283 
  $19,426   12,688 
Schedule Of Investments In Corporate Convertible Bonds [Table Text Block]

Following is a summary of the corporate bonds as of December 31, 2011:

 

  December 31, 2011 
  Aggregate  Gross
unrealized		  Discount  Aggregate
market		 
  Cost  gains  amortization  Value 
  (in thousands) 
Corporate bond-available for sale $4,365   596   119   5,080 

 

Following is a summary of the separated conversion options as of December 31, 2011:

 

  December 31, 2011 
  Aggregate  Gross unrealized  Fair 
  Cost  gains  losses  value 
  (in thousands) 
Conversion option $684   -   510   174