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Investments in Companies (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Summary of investments [Abstract]
Income allocated to minority interests	$ 242,000	$ 434,000	$ 447,000	$ 875,000
Investments in unconsolidated privately-held entities, included in other assets	200,000		200,000		200,000
AXT, Inc. [Member]
Summary of investments [Abstract]
Gross equity earnings (losses) from minority-owned joint ventures that are not consolidated, recorded as other income	2,607,000	2,034,000	4,726,000	3,329,000
Equity Method Investments [Member]
Summary of investments [Abstract]
Equity method investment by parent	7,985,000		7,985,000		7,537,000
Number of equity investment entities	3		3		3
Minority investment in consolidated joint venture, included in other assets	3,700,000		3,700,000		3,400,000
Gross equity earnings (losses) from minority-owned joint ventures that are not consolidated, recorded as other income	625,000	471,000	1,100,000	753,000
Joint Ventures [Member]
Summary of investments [Abstract]
Number of consolidated joint ventures	3	3	3	3
Income from three consolidated joint ventures	1,100,000	1,400,000	1,800,000	2,700,000
Income allocated to minority interests	242,000	434,000	447,000	875,000
Net income from joint ventures attributable to parent	847,000	963,000	1.4	1.8
Majority-owned Subsidiaries [Member]
Summary of investments [Abstract]
Investments, consolidated	5,269,000		5,269,000		5,269,000
Beijing JiYa Semiconductor Material Co., Ltd [Member] | Majority-owned Subsidiaries [Member]
Summary of investments [Abstract]
Investments, consolidated	3,331,000		3,331,000		3,331,000
Percentage of ownership, consolidated method (in hundredths)			46.00%
Nanjing Jin Mei Gallium Co., Ltd [Member] | Majority-owned Subsidiaries [Member]
Summary of investments [Abstract]
Investments, consolidated	592,000		592,000		592,000
Percentage of ownership, consolidated method (in hundredths)			83.00%
Beijing BoYu Semiconductor Vessel Craftwork Technology Co., Ltd [Member] | Majority-owned Subsidiaries [Member]
Summary of investments [Abstract]
Investments, consolidated	1,346,000		1,346,000		1,346,000
Percentage of ownership, consolidated method (in hundredths)			70.00%
Donghai County Dongfang High Purity Electronic Materials Co., Ltd [Member] | Equity Method Investments [Member]
Summary of investments [Abstract]
Equity method investment by parent	1,833,000		1,833,000		1,900,000
Percentage of ownership, equity method (in hundredths)	46.00%		46.00%
Xilingol Tongli Germanium Co. Ltd [Member] | Equity Method Investments [Member]
Summary of investments [Abstract]
Equity method investment by parent	5,216,000		5,216,000		4,692,000
Percentage of ownership, equity method (in hundredths)	25.00%		25.00%
Emeishan Jia Mei High Purity Metals Co., Ltd [Member] | Equity Method Investments [Member]
Summary of investments [Abstract]
Equity method investment by parent	$ 936,000		$ 936,000		$ 945,000
Percentage of ownership, equity method (in hundredths)	25.00%		25.00%

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- Definition

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee excludes equity method investees invested by consolidated joint ventures. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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Total investments in (A) entities in which the entity has significant influence and control, (B) joint ventures that are consolidated, but (C) entities in which local management manage daily operations, (D) entities that not required additional investment of financial support from the parent entity.

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Amount, after adjustment, of cost-method investment. Adjustments include, but are not limited to, dividends received in excess of earnings after date of investment that are considered a return of investment and other than temporary impairments.

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Carrying amount of the equity interests owned by noncontrolling shareholders, partners, or other equity holders in joint ventures included in the entity's consolidated financial statements.

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