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Investments in Privately-held Companies, Minority Investment Entities (Details) (USD $) | 3 Months Ended
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Mar. 31, 2014 | Mar. 31, 2013
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 Sales | $ 13,480,000 | $ 9,273,000
Gross profit | 3,963,000 | 3,124,000
Operating income | 2,664,000 | 1,614,000
Net income | 2,119,000 | 1,295,000
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 | $ 487,000 | $ 282,000

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