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Investments in Privately-Held Raw Material Companies (Details)			1 Months Ended			3 Months Ended			6 Months Ended
	Jun. 15, 2018 USD ($) installment	Nov. 02, 2017 USD ($)	Apr. 30, 2020 USD ($)	May 31, 2019 USD ($)	Sep. 30, 2018 USD ($) employee entity	Jun. 30, 2020 USD ($) employee	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Jun. 30, 2020 USD ($) employee entity	Jun. 30, 2019 USD ($)	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						$ 5,613,000			$ 5,613,000		$ 5,961,000
Proceeds from sale of previously consolidated subsidiary shares								$ 366,000	366,000
Gain on deconsolidation								175,000		$ 175,000
Additional percentage of ownership, consolidated method					2
Payment of first installment										262,000
Noncontrolling interests						5,692,000			5,692,000		4,877,000
Remainder portion of payment						78,000			78,000		151,000
Number of persons on board \| employee					1
Net income attributable to noncontrolling interests						598,000	$ 287,000		993,000	368,000
Impairment charge						0	0	$ 1,100,000	$ 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						1,600,000	800,000		$ 2,700,000	1,500,000
Net income attributable to noncontrolling interests						600,000	300,000		1,000,000.0	400,000
Net income (loss) from joint ventures attributable to parent						1,000,000.0	$ 500,000		1,700,000	$ 1,100,000
Other assets
Summary of investments
Investments, equity method						5,600,000			$ 5,600,000		6,000,000.0
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						$ 1,383,000			$ 1,383,000		1,326,000
Percentage of ownership, equity method (in hundredths)						46.00%			46.00%
Beijing JiYa Semiconductor Material Co., Ltd Investment \| Beijing JiYa Semiconductor Material Co., Ltd Investment
Summary of investments
Investments, equity method						$ 1,318,000			$ 1,318,000		1,621,000
Percentage of ownership, equity method (in hundredths)						39.00%			39.00%
Xilingol Tongli Germanium Co. Ltd Investment \| Xilingol Tongli Germanium Co. Ltd Investment
Summary of investments
Investments, equity method						$ 0			$ 0
Percentage of ownership, equity method (in hundredths)						25.00%			25.00%
Xiaoyi XingAn Gallium Co., Ltd. \| Xiaoyi XingAn Gallium Co., Ltd.
Summary of investments
Investments, consolidated method						$ 2,351,000			$ 2,351,000		2,367,000
Percentage of ownership, equity method (in hundredths)						25.00%			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						$ 561,000			$ 561,000		647,000
Percentage of ownership, equity method (in hundredths)						25.00%			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			2
Majority-Owned Subsidiaries
Summary of investments
Investments, consolidated method						$ 1,938,000			$ 1,938,000		1,938,000
Nanjing JinMei Gallium Co., Ltd Investment
Summary of investments
Investments, consolidated method						$ 592,000			$ 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		$ 73,000	262,000
Payment of second installment				1,200,000
Noncontrolling interests												$ 0
Remainder portion of payment				$ 78,000
Nanjing JinMei Gallium Co., Ltd Investment \| Nanjing JinMei Gallium Co., Ltd Investment
Summary of investments
Percentage of ownership, consolidated method (in hundredths)						100.00%			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%			46.00%
Beijing BoYu Semiconductor Vessel Craftwork Technology Co., Ltd Investment
Summary of investments
Investments, consolidated method						$ 1,346,000			$ 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%			63.00%									70.00%