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Investments in Privately-Held Raw Material Companies (Details)				1 Months Ended						3 Months Ended			6 Months Ended		12 Months Ended
	Jan. 25, 2021 USD ($)	Jun. 15, 2018 USD ($) installment	Nov. 02, 2017 USD ($) employee	Jan. 31, 2021 USD ($)	Aug. 31, 2020 USD ($)	Jul. 31, 2020 USD ($)	Apr. 30, 2020 USD ($)	May 31, 2019 USD ($)	Sep. 30, 2018 USD ($) employee entity	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2019 USD ($)	Jun. 30, 2021 USD ($) entity employee	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019	Jun. 01, 2019 USD ($)	Apr. 30, 2019	Aug. 31, 2018	Jun. 14, 2018	Nov. 01, 2017
Summary of investments
Investments, equity method										$ 8,277,000			$ 8,277,000		$ 6,376,000
Increase in redeemable noncontrolling interests due to issuance of Tongmei's common stock				$ 1,500,000									1,514,000
Investments, Approved by Government	$ 49,000,000
Noncontrolling interests										17,479,000			17,479,000		15,350,000
Remainder portion of payment															1,439,000
Number of persons on board \| employee									1
Impairment charge										0	$ 0	$ 1,100,000	0	$ 0
Joint Ventures
Summary of investments
Number of consolidated joint ventures \| entity									3
Other assets
Summary of investments
Investments, equity method										8,300,000			$ 8,300,000		6,400,000
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										$ 1,878,000			$ 1,878,000		1,651,000
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										$ 2,767,000			$ 2,767,000		1,418,000
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										$ 3,248,000			$ 3,248,000		2,822,000
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										$ 384,000			$ 384,000		$ 485,000
Percentage of ownership, equity method (in hundredths)										25.00%			25.00%
Nanjing JinMei Gallium Co., Ltd Investment
Summary of investments
Percentage of ownership, consolidated method (in hundredths)								100.00%										97.00%
Percentage of outstanding shares															8.50%
Beijing BoYu Semiconductor Vessel Craftwork Technology Co., Ltd Investment
Summary of investments
Percentage of ownership, consolidated method (in hundredths)															67.00%	63.00%
Percentage of outstanding shares															33.00%
Beijing Tongmei Xtal Technology
Summary of investments
Percentage of ownership, consolidated method (in hundredths)										85.50%			85.50%
Percentage of outstanding shares	7.28%									14.50%			14.50%
Percentage of Equity Issued on Conversion of Non Controlling Interests	7.28%												14.50%
Percentage of Equity Purchased by Employees, Key Managers and Contributors															0.40%
Increase in redeemable noncontrolling interests due to issuance of Tongmei's common stock				$ 1,500,000											$ 48,100,000
Investments, Approved by Government	$ 49,000,000
Nanjing JinMei Gallium Co., Ltd
Summary of investments
Number of new board representatives \| employee													2
Nanjing JinMei Gallium Co., Ltd \| Beijing Tongmei Xtal Technology
Summary of investments
Percentage of Equity Issued on Conversion of Non Controlling Interests															0.38%
Beijing Boyu Semiconductor Vessel Craftwork Technology Co Ltd
Summary of investments
Number of new board representatives \| employee			2
Beijing Boyu Semiconductor Vessel Craftwork Technology Co Ltd \| Beijing Tongmei Xtal Technology
Summary of investments
Percentage of Equity Issued on Conversion of Non Controlling Interests															7.59%
Majority-Owned Subsidiaries
Summary of investments
Investments, consolidated method										$ 5,572,000			$ 5,572,000		$ 3,758,000
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	2
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				$ 29,000	$ 73,000	262,000
Payment of second installment								1,200,000
Noncontrolling interests																	$ 0
Remainder portion of payment								$ 49,000
Nanjing JinMei Gallium Co., Ltd Investment \| Nanjing JinMei Gallium Co., Ltd Investment
Summary of investments
Percentage of ownership, consolidated method (in hundredths)		95.00%							97.00%	85.50%			85.50%						95.00%	83.00%
Chaoyang JinMei Gallium Co., Ltd[member]
Summary of investments
Investments, consolidated method										$ 1,820,000			$ 1,820,000		1,820,000
Chaoyang JinMei Gallium Co., Ltd[member] \| Chaoyang JinMei Gallium Co., Ltd[member]
Summary of investments
Percentage of ownership, consolidated method (in hundredths)					91.50%	100.00%				85.50%			85.50%
Percentage Of Ownership Interest Sold					8.50%
Proceeds from sale of previously consolidated subsidiary shares					$ 396,000
Beijing BoYu Semiconductor Vessel Craftwork Technology Co., Ltd Investment
Summary of investments
Investments, consolidated method										$ 1,346,000			$ 1,346,000		$ 1,346,000
Additional percentage of ownership, consolidated method															4
Purchase of subsidiary shares from noncontrolling interest															$ 1,600,000
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%
Additional percentage of ownership, consolidated method															4
Purchase of subsidiary shares from noncontrolling interest															$ 1,600,000
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%							85.50%			85.50%								70.00%
ChaoYang XinMei High Purity Semiconductor Materials Co., Ltd
Summary of investments
Investments, consolidated method										$ 1,814,000			$ 1,814,000
ChaoYang XinMei High Purity Semiconductor Materials Co., Ltd \| ChaoYang XinMei High Purity Semiconductor Materials Co., Ltd
Summary of investments
Percentage of ownership, consolidated method (in hundredths)										58.50%			58.50%