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Percentage of equity interest sold.

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The percentage of equity issued on conversion of noncontrolling interests.

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The percentage of equity purchased by employees, key managers and Contributors.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Amount of gain (loss) on sale or disposal of an equity method investment.

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Percentage of ownership of equity interest excluding interest in entity that is consolidated and equity method investee.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

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The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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Includes other investments and securities that are not at fair value as of the balance sheet date and those that are not accounted for under the equity method.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Dividends received on equity and other investments during the current period.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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The cash inflow associated with the sale of equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

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Value of new stock classified as temporary equity issued during the period.

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Investments in Privately-held Raw Material Companies (Details) - USD ($)			1 Months Ended										12 Months Ended
	May 31, 2023	Jan. 25, 2021	Nov. 30, 2023	May 31, 2023	Apr. 30, 2023	Jan. 31, 2023	Aug. 31, 2022	Jul. 31, 2022	Jun. 30, 2022	Apr. 30, 2022	Jun. 30, 2021	Jan. 31, 2021	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Sep. 30, 2023	Aug. 31, 2023	Jul. 31, 2023	Sep. 30, 2022
Summary of investments
Investments, equity method													$ 12,476,000	$ 12,720,000
Investment, cost method													551,000	1,887,000
Dividend received													$ 4,316,000	1,608,000	$ 774,000
Percentage of equity interest sold													15.00%
Proceeds from sale of equity method investments													$ 827,000
Loss on sale of equity investment													(166,000)
Fair value of the consideration received													779,000
3rd Party Investor
Summary of investments
Percentage of equity interest sold			46.00%
Other assets
Summary of investments
Investments, equity method													$ 12,500,000	14,600,000
Donghai County Dongfang High Purity Electronic Materials Co., Ltd Investment
Summary of investments
Investment, cost method														1,887,000
Percentage of ownership, equity method			46.00%
Percentage of ownership, cost method			0.00%										0.00%
Percentage of equity interest sold			46.00%										46.00%
Loss on sale of equity investment													$ (1,125,000)
Fair value of the consideration received			$ 600,000										585,000
Beijing JiYa Semiconductor Material Co., Ltd Investment
Summary of investments
Investments, equity method													$ 3,806,000	6,381,000
Percentage of ownership, equity method													39.00%
Dividends received			$ 500,000		$ 2,000,000.0		$ 100,000
PRC subsidiaries and PRC raw material joint ventures
Summary of investments
Dividends received													$ 4,300,000	2,900,000	$ 774,000
Beijing BoYu Semiconductor Vessel Craftwork Technology Co., Ltd Investment
Summary of investments
Dividends received									$ 1,300,000
Xiaoyi XingAn Gallium Co., Ltd.
Summary of investments
Investments, equity method													$ 5,516,000	5,094,000
Percentage of ownership, equity method													25.00%
Dividends received								$ 1,500,000		$ 1,800,000	$ 774,000
ChaoYang KaiMei Quartz Co., Ltd
Summary of investments
Investments, equity method						$ 900,000				$ 3,000,000.0			$ 3,154,000	827,000			$ 2,300,000	$ 600,000	$ 600,000
Percentage of ownership, equity method										40.00%			40.00%
Emeishan Jia Mei High Purity Metals Co., Ltd Investment
Summary of investments
Investments, equity method														$ 418,000
Investment, cost method													$ 551,000
Percentage of ownership, equity method	25.00%			25.00%									10.00%
Percentage of ownership, cost method	10.00%			10.00%									10.00%
Percentage of equity interest sold	15.00%												15.00%
Proceeds from sale of equity method investments	$ 10			$ 827,000
Loss on sale of equity investment				575,000									$ 575,000
Nanjing JinMei Gallium Co., Ltd Investment
Summary of investments
Percentage of outstanding shares																8.50%
Nanjing JinMei Gallium Co., Ltd Investment \| Beijing JiYa Semiconductor Material Co., Ltd Investment
Summary of investments
Percentage of ownership, equity method													39.00%
Nanjing JinMei Gallium Co., Ltd Investment \| Emeishan Jia Mei High Purity Metals Co., Ltd Investment
Summary of investments
Percentage of ownership, equity method													25.00%
Beijing BoYu Semiconductor Vessel Craftwork Technology Co., Ltd Investment
Summary of investments
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
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																0.0038%
Beijing Boyu Semiconductor Vessel Craftwork Technology Co Ltd \| Beijing BoYu Semiconductor Vessel Craftwork Technology Co., Ltd Investment
Summary of investments
Private equity ownership percentage																7.59%
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													$ 14,211,000	$ 12,089,000
Nanjing JinMei Gallium Co., Ltd Investment
Summary of investments
Investments, consolidated method													$ 592,000	592,000
Nanjing JinMei Gallium Co., Ltd Investment \| Nanjing JinMei Gallium Co., Ltd Investment
Summary of investments
Percentage of ownership, consolidated method (in hundredths)													85.50%
ChaoYang Jin Mei Gallium Co., Ltd
Summary of investments
Investments, consolidated method													$ 1,820,000	1,820,000
ChaoYang Jin Mei Gallium Co., Ltd \| ChaoYang Jin Mei Gallium Co., Ltd
Summary of investments
Percentage of ownership, consolidated method (in hundredths)													85.50%
Beijing BoYu Semiconductor Vessel Craftwork Technology Co., Ltd Investment
Summary of investments
Investments, consolidated method													$ 1,346,000	1,346,000
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)													85.50%
ChaoYang ShuoMei High Purity Semiconductor Materials Co., Ltd.
Summary of investments
Investments, consolidated method													$ 3,122,000	1,000,000
Increase in redeemable noncontrolling interests				$ 75,000		$ 36,000
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	$ 7,331,000
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%