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Investments in Privately-Held Raw Material Companies (Details)				1 Months Ended							9 Months Ended		12 Months Ended
	Jan. 25, 2021 USD ($)	Jun. 15, 2018 USD ($) installment	Nov. 02, 2017 USD ($)	Aug. 31, 2022 USD ($)	Jul. 31, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jan. 31, 2021 USD ($)	Aug. 31, 2020 USD ($)	May 31, 2019 USD ($)	Sep. 30, 2018 USD ($) employee entity	Sep. 30, 2022 USD ($) employee	Sep. 30, 2021 USD ($)	Dec. 31, 2020 USD ($) employee	Apr. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)	Nov. 30, 2020	Jul. 31, 2020	Jun. 01, 2019 USD ($)	Apr. 30, 2019	Aug. 31, 2018	Jun. 14, 2018	Nov. 01, 2017
Summary of investments
Investments, equity method											$ 13,727,000				$ 10,166,000
Noncontrolling interests											23,009,000				18,317,000
Number of persons on board \| employee										1
Impairment charge											0	$ 0
Joint Ventures [Member]
Summary of investments
Number of consolidated joint ventures \| entity										3
Other assets
Summary of investments
Investments, equity method											13,700,000				10,200,000
Donghai County Dongfang High Purity Electronic Materials Co., Ltd Investment
Summary of investments
Investments, equity method											$ 1,842,000				2,053,000
Percentage of ownership, equity method											46.00%
Beijing JiYa Semiconductor Material Co., Ltd Investment
Summary of investments
Investments, equity method											$ 6,029,000				3,760,000
Percentage of ownership, equity method											39.00%
Dividends received				$ 125,000
Xilingol Tongli Germanium Co. Ltd Investment
Summary of investments
Percentage of ownership, equity method											25.00%
Xiaoyi XingAn Gallium Co., Ltd.
Summary of investments
Investments, equity method											$ 4,647,000				4,095,000
Percentage of ownership, equity method											25.00%
Dividends received					$ 1,500,000	$ 774,000
ChaoYang KaiMei Quartz Co., Ltd
Summary of investments
Investments, equity method											$ 843,000			$ 3,000,000.0
Percentage of ownership, equity method											40.00%			40.00%
Emeishan Jia Mei High Purity Metals Co., Ltd Investment
Summary of investments
Investments, equity method											$ 366,000				258,000
Percentage of ownership, equity method											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%
Percentage of outstanding shares	7.28%										14.50%
Private equity ownership percentage	7.28%										14.50%
Percentage of key managers and contributors purchased													0.40%
Increase in redeemable noncontrolling interests							$ 1,500,000						$ 48,100,000
Investments, government approved	$ 49,000,000
Raised additional capital							$ 1,500,000
Nanjing JinMei Gallium Co., Ltd
Summary of investments
Number of new board representatives \| employee											2
Nanjing JinMei Gallium Co., Ltd \| Nanjing JinMei Gallium Co., Ltd Investment
Summary of investments
Private equity ownership percentage													0.38%
Nanjing JinMei Gallium Co., Ltd \| Beijing Tongmei Xtal Technology
Summary of investments
Private equity ownership percentage													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
Private equity ownership percentage													7.59%
Majority-Owned Subsidiaries [Member]
Summary of investments
Investments, consolidated method											$ 12,089,000				5,572,000
Nanjing JinMei Gallium Co., Ltd Investment
Summary of investments
Investments, consolidated method											$ 592,000				592,000
Additional percentage of ownership, consolidated method		12							3	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
Payment of second installment									$ 1,200,000
Noncontrolling interests																		$ 0
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%									95.00%	83.00%
ChaoYang Jin Mei Gallium Co., Ltd [Member]
Summary of investments
Investments, consolidated method											$ 1,820,000				1,820,000
ChaoYang Jin Mei Gallium Co., Ltd [Member] \| ChaoYang Jin Mei Gallium Co., Ltd [Member]
Summary of investments
Percentage of ownership, consolidated method (in hundredths)								91.50%			85.50%						100.00%
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
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%
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%											70.00%
ChaoYang ShuoMei High Purity Semiconductor Materials Co., Ltd.
Summary of investments
Investments, consolidated method											$ 1,000,000
ChaoYang ShuoMei High Purity Semiconductor Materials Co., Ltd. \| ChaoYang ShuoMei High Purity Semiconductor Materials Co., Ltd.
Summary of investments
Percentage of ownership, consolidated method (in hundredths)											75.00%
Chao Yang XinMei High Purity Semiconductor Materials Co. Ltd.
Summary of investments
Investments, consolidated method											$ 7,331,000				$ 1,814,000
Chao Yang XinMei High Purity Semiconductor Materials Co. Ltd. \| Chao Yang XinMei High Purity Semiconductor Materials Co. Ltd.
Summary of investments
Percentage of ownership, consolidated method (in hundredths)											58.50%