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Investments in Privately-Held Raw Material Companies (Details)			1 Months Ended		3 Months Ended
	Jun. 15, 2018 USD ($) installment	Nov. 02, 2017 USD ($)	May 31, 2019 USD ($)	Sep. 30, 2018 USD ($) employee entity	Mar. 31, 2020 USD ($) employee entity	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)	Jun. 01, 2019 USD ($)	Apr. 30, 2019	Mar. 11, 2019	Mar. 10, 2019	Aug. 31, 2018	Jun. 14, 2018	Nov. 01, 2017
Summary of investments
Investments, equity method					$ 5,769,000		$ 5,961,000
Proceeds from sale of previously consolidated subsidiary shares					366,000	$ 366,000
Gain on deconsolidation						175,000
Additional percentage of ownership, consolidated method				2
Noncontrolling interests					5,174,000		4,877,000
Remainder portion of payment					151,000		151,000
Number of persons on board \| employee				1
Net income attributable to noncontrolling interests					395,000	81,000
Impairment charge					$ 0	1,100,000
Impaired entities \| entity					1
Joint Ventures
Summary of investments
Number of consolidated joint ventures \| entity				3
Income from consolidated joint ventures					$ 1,100,000	700,000
Net income attributable to noncontrolling interests					395,000	81,000
Net income (loss) from joint ventures attributable to parent					700,000	$ 600,000
Other assets
Summary of investments
Investments, equity method					$ 5,800,000		6,000,000
Xilingol Tongli Germanium Co. Ltd Investment
Summary of investments
Direct minority investments not consolidated \| entity					1
Donghai County Dongfang High Purity Electronic Materials Co., Ltd Investment \| Donghai County Dongfang High Purity Electronic Materials Co., Ltd Investment
Summary of investments
Investments, equity method					$ 1,327,000		1,326,000
Percentage of ownership, equity method (in hundredths)					46.00%
Beijing JiYa Semiconductor Material Co., Ltd Investment \| Beijing JiYa Semiconductor Material Co., Ltd Investment
Summary of investments
Investments, equity method					$ 1,446,000		1,621,000
Percentage of ownership, equity method (in hundredths)					39.00%
Xilingol Tongli Germanium Co. Ltd Investment \| Xilingol Tongli Germanium Co. Ltd Investment
Summary of investments
Investments, equity method					$ 0
Percentage of ownership, equity method (in hundredths)					25.00%
Xiaoyi XingAn Gallium Co., Ltd. \| Xiaoyi XingAn Gallium Co., Ltd.
Summary of investments
Investments, consolidated method					$ 2,401,000		2,367,000
Percentage of ownership, equity method (in hundredths)					25.00%
Emeishan Jia Mei High Purity Metals Co., Ltd Investment \| Emeishan Jia Mei High Purity Metals Co., Ltd Investment
Summary of investments
Investments, equity method					$ 595,000		647,000
Percentage of ownership, equity method (in hundredths)					25.00%
Beijing JiYa Semiconductor Material Co., Ltd Investment
Summary of investments
Percentage of ownership, consolidated method (in hundredths)										39.00%	46.00%
Beijing JiYa Semiconductor Material Co., Ltd Investment \| Beijing JiYa Semiconductor Material Co., Ltd Investment
Summary of investments
Percentage of ownership, consolidated method (in hundredths)										39.00%	46.00%
Nanjing JinMei Gallium Co., Ltd Investment
Summary of investments
Percentage of ownership, consolidated method (in hundredths)			100.00%						97.00%
Nanjing JinMei Gallium Co., Ltd
Summary of investments
Number of new board representatives \| employee					2
Beijing Boyu Semiconductor Vessel Craftwork Technology Co Ltd
Summary of investments
Number of persons on board \| employee					2
Majority-Owned Subsidiaries
Summary of investments
Investments, consolidated method					$ 1,938,000		1,938,000
Nanjing JinMei Gallium Co., Ltd Investment
Summary of investments
Investments, consolidated method					$ 592,000		592,000
Additional percentage of ownership, consolidated method	12		3
Purchase of subsidiary shares from noncontrolling interest	$ 1,400,000		$ 413,000	$ 252,000
Number of installments \| installment	2
Payment of first installment	$ 163,000		262,000
Payment of second installment			1,200,000
Noncontrolling interests								$ 0
Remainder portion of payment			$ 151,000
Nanjing JinMei Gallium Co., Ltd Investment \| Nanjing JinMei Gallium Co., Ltd Investment
Summary of investments
Percentage of ownership, consolidated method (in hundredths)					100.00%							95.00%	83.00%
Beijing JiYa Semiconductor Material Co., Ltd Investment \| Beijing JiYa Semiconductor Material Co., Ltd Investment
Summary of investments
Percentage of ownership, consolidated method (in hundredths)					46.00%
Beijing BoYu Semiconductor Vessel Craftwork Technology Co., Ltd Investment
Summary of investments
Investments, consolidated method					$ 1,346,000		$ 1,346,000
Gain (loss) from equity transaction		$ 0
Beijing BoYu Semiconductor Vessel Craftwork Technology Co., Ltd Investment \| 3rd party investor
Summary of investments
Percentage ownership from issuance of shares		10.00%
Raised additional capital		$ 2,000,000
Beijing BoYu Semiconductor Vessel Craftwork Technology Co., Ltd Investment \| Beijing BoYu Semiconductor Vessel Craftwork Technology Co., Ltd Investment
Summary of investments
Percentage of ownership, consolidated method (in hundredths)					63.00%									70.00%