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Investment securities, including securities measured at fair value (Tables) | 12 Months Ended
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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 |

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- Definition Entire tabular disclosure of investments in corporate convertible bonds. + References No definition available. + Details
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- Definition A tabular disclosure of (a) the aggregate carrying amount of all cost-method investments; (b) the aggregate carrying amount of cost-method investments that the investor did not evaluate for impairment for cost-method investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6872867&loc=d3e40691-111596 + Details
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