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Investments in Companies, Minority Investment Entities (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
AXT, Inc. [Member] |  |  |  |
Summarized income information of all the minority investment entities that are not consolidated and accounted for under the equity method [Abstract] |  |  |  |
Net revenue | $ 11,004,000 | $ 13,466,000 | $ 20,329,000 | $ 26,946,000
Gross profit | 3,625,000 | 8,124,000 | 5,920,000 | 12,087,000
Operating income | 2,292,000 | 3,424,000 | 3,343,000 | 6,088,000
Net income | 1,784,000 | 2,607,000 | 2,741,000 | 4,726,000
Equity Method Investments [Member] |  |  |  |
Summarized income information of all the minority investment entities that are not consolidated and accounted for under the equity method [Abstract] |  |  |  |
Net income | $ 410,000 | $ 625,000 | $ 610,000 | $ 1,100,000

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