Represents direct investments by the entity. Recorded by equity and consolidated methods.

No definition available.

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Represents the duration an employee has worked for the entity.

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Amount of gain in equity method investment realized in equity transaction.

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Amount of net income (loss) generated by joint ventures in which entity has investment.

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No definition available.

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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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No definition available.

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- Definition

Represents information pertaining to minority investments in privately held companies through consolidated joint ventures.

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No definition available.

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- Definition

Represents amount of net income (loss) generated by consolidated joint ventures attributable to parent after allocating the share of minority interest.

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No definition available.

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- Definition

Represents the number of gallium companies with an impairment charge.

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No definition available.

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Represents number of joint ventures in which entity has interest and therefore has consolidated the figures as the date of reporting.

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No definition available.

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- Definition

Represents the number of direct minority investment entities that are not consolidated.

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No definition available.

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Represents the number of new board representatives

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No definition available.

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Represents the number of individuals on the board

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No definition available.

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- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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- Definition

The amount of net income (loss) reported by an equity method investment of the entity.

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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. 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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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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Amount of Net Income (Loss) attributable to noncontrolling interest.

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Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

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Investments in Privately Held Companies (Details)		3 Months Ended		12 Months Ended
Investments in Privately Held Companies (Details)	Nov. 02, 2017 USD ($)	Mar. 31, 2018 USD ($) employee subsidiary entity item	Mar. 31, 2017 USD ($) subsidiary	Dec. 31, 2017 USD ($) entity	Mar. 31, 2017 entity	Mar. 31, 2017 company	Mar. 31, 2017 USD ($)
Summary of investments [Abstract]
Direct investments \| item		6
Indirect investments \| item		4
Investments in privately-held companies		$ 5,453,000		$ 5,578,000
Number of consolidated joint ventures \| subsidiary		1	1
Net loss attributable to noncontrolling interests		$ 315,000	$ (240,000)
Net income		$ (334,000)	(933,000)
Direct minority investments not consolidated \| entity		3		3
Impairment charge		$ 0
Joint Ventures
Summary of investments [Abstract]
Indirect investments \| entity		4
Number of consolidated joint ventures \| entity		3
Income (loss) from consolidated joint ventures		$ 1,400,000	(12,000)
Net loss attributable to noncontrolling interests		315,000	(240,000)
Net income (loss) from joint ventures attributable to parent		1,100,000	228,000
Other assets
Summary of investments [Abstract]
Investments in privately-held companies		9,700,000		$ 9,800,000
Other assets \| Joint Ventures
Summary of investments [Abstract]
Minority investment in consolidated joint venture, included in other assets		4,300,000		4,300,000
Beijing JiYa Semiconductor Material Co., Ltd Investment
Summary of investments [Abstract]
Investments, consolidated		$ 3,331,000		3,331,000
Percentage of ownership, consolidated method (in hundredths)		46.00%
Nanjing JinMei Gallium Co., Ltd Investment
Summary of investments [Abstract]
Investments, consolidated		$ 592,000		592,000
Percentage of ownership, consolidated method (in hundredths)		83.00%
Beijing BoYu Semiconductor Vessel Craftwork Technology Co., Ltd Investment
Summary of investments [Abstract]
Investments, consolidated		$ 1,346,000		1,346,000
Percentage of ownership, consolidated method (in hundredths)	70.00%	63.00%
Investment gain	$ 0
Beijing BoYu Semiconductor Vessel Craftwork Technology Co., Ltd Investment \| 3rd party investor
Summary of investments [Abstract]
Investments, consolidated	$ 2,000,000
Percentage of ownership, consolidated method (in hundredths)	10.00%
Donghai County Dongfang High Purity Electronic Materials Co., Ltd Investment
Summary of investments [Abstract]
Investments in privately-held companies		$ 1,525,000		1,473,000
Percentage of ownership, equity method (in hundredths)		46.00%
Xilingol Tongli Germanium Co. Ltd Investment
Summary of investments [Abstract]
Investments in privately-held companies		$ 3,017,000		3,190,000
Percentage of ownership, equity method (in hundredths)		25.00%
Emeishan Jia Mei High Purity Metals Co., Ltd Investment
Summary of investments [Abstract]
Investments in privately-held companies		$ 911,000		915,000
Percentage of ownership, equity method (in hundredths)		25.00%
One Gallium Company
Summary of investments [Abstract]
Investments in privately-held companies							$ 0
Impairment charge			$ 313,000
Number of gallium companies with impairment charge					1	1
Beijing JiYa Semiconductor Material Co., Ltd
Summary of investments [Abstract]
Indirect investments \| entity		3
Number of persons on board \| employee		1
Employee duration		27 years
Beijing Boyu Semiconductor Vessel Craftwork Technology Co Ltd
Summary of investments [Abstract]
Number of persons on board \| employee		2
Nanjing JinMei Gallium Co., Ltd
Summary of investments [Abstract]
Number of new board representatives \| employee		2
Majority-Owned Subsidiaries
Summary of investments [Abstract]
Investments, consolidated		$ 5,269,000		$ 5,269,000
Jinmei
Summary of investments [Abstract]
Indirect investments \| entity		1