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Investment securities (Tables) | 12 Months Ended
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Dec. 31, 2013
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, 2012 and 2013:
|  | December 31, |
|  | 2012 |  | 2013 |
|  | (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 |
S Company |  |  | - |  |  | 5,189 |
L Company |  |  | - |  |  | 4,000 |
eTurboTouch Technology Inc. |  |  | 477 |  |  | 477 |
Oculon Optoelectronics Inc. |  |  | 309 |  |  | 309 |
Shinyoptics Corp. |  |  | 283 |  |  | 283 |
|  | $ | 12,688 |  |  | 21,877 |

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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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