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Investments in Privately-Held Raw Material Companies (Details)			1 Months Ended	3 Months Ended	9 Months Ended	12 Months Ended
	Jun. 15, 2018 USD ($) installment	Nov. 02, 2017 USD ($)	May 31, 2019 USD ($)	Mar. 31, 2019 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2019 USD ($) employee entity subsidiary	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($) company	Jun. 30, 2019	Jun. 01, 2019 USD ($)	May 11, 2019	May 10, 2019	Apr. 30, 2019	Mar. 11, 2019	Mar. 10, 2019	Jan. 31, 2019 subsidiary	Aug. 31, 2018	Jun. 14, 2018	Nov. 01, 2017	Mar. 31, 2017 USD ($)
Summary of investments
Investments, equity method						$ 5,961,000	$ 8,422,000
Proceeds from sale of previously consolidated subsidiary shares						366,000
Gain on deconsolidation						$ 175,000
Additional percentage of ownership, consolidated method						2
Payment of first installment						$ 262,000	415,000
Noncontrolling interests						4,877,000	3,697,000
Remainder portion of payment						$ 151,000	1,147,000
Number of persons on board						1
Number of consolidated joint ventures \| subsidiary						1										1
Net income attributable to noncontrolling interests						$ 1,012,000	1,355,000	$ (87,000)
Impairment charge						$ 1,100,000	0
Impaired entities \| entity						1
Joint Ventures
Summary of investments
Number of consolidated joint ventures \| entity						3
Income from consolidated joint ventures				$ 1,100,000		$ 4,300,000	5,500,000	2,100,000
Net income attributable to noncontrolling interests						1,000,000	(1,400,000)	(100,000)
Net income (loss) from joint ventures attributable to parent						3,300,000	4,100,000	2,200,000
Other assets
Summary of investments
Investments, equity method						6,000,000	8,400,000
Variable Interest Entity
Summary of investments
Investments, equity method						5,961,000	3,958,000
One Gallium Company
Summary of investments
Investments, equity method																				$ 0
Impairment charge								$ 313,000
Number of gallium companies with impairment charge \| company								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						$ 1,326,000	1,416,000
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						$ 1,621,000
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						$ 25	1,700,000
Percentage of ownership, equity method (in hundredths)						25.00%
Xiaoyi XingAn Gallium Co., Ltd. \| Xiaoyi XingAn Gallium Co., Ltd.
Summary of investments
Investments, equity method						$ 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						$ 647,000	842,000
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%		39.00%	46.00%
Nanjing JinMei Gallium Co., Ltd Investment
Summary of investments
Percentage of ownership, consolidated method (in hundredths)			100.00%						100.00%				97.00%
Additional percentage of ownership, consolidated method			3
Beijing JiYa Semiconductor Material Co., Ltd
Summary of investments
Percentage of ownership, equity method (in hundredths)						39.00%
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 new board representatives \| employee						2
Majority-Owned Subsidiaries
Summary of investments
Investments, consolidated method						$ 1,938,000	5,269,000
Nanjing JinMei Gallium Co., Ltd Investment
Summary of investments
Investments, consolidated method						$ 592,000	592,000
Additional percentage of ownership, consolidated method	12		3.00
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%												83.00%
Nanjing JinMei Gallium Co., Ltd Investment \| Nanjing JinMei Gallium Co., Ltd \| Nanjing JinMei Gallium Co., Ltd Investment
Summary of investments
Percentage of ownership, consolidated method (in hundredths)																	95.00%
Beijing JiYa Semiconductor Material Co., Ltd Investment
Summary of investments
Investments, consolidated method						$ 46	3,331,000
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%