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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 ($)	Aug. 31, 2023 USD ($)	May 31, 2023 USD ($)	Apr. 30, 2023 USD ($)	Jan. 31, 2023 USD ($)	Aug. 31, 2022 USD ($)	Jul. 31, 2022 USD ($)	Jun. 30, 2022 USD ($)	Jan. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Aug. 31, 2020 USD ($)	Sep. 30, 2023 USD ($) employee	Dec. 31, 2020 USD ($) employee	Jul. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Apr. 30, 2022 USD ($)	Jun. 30, 2021	Nov. 30, 2020	Jul. 31, 2020
Summary of investments
Investments, equity method												$ 13,201,000			$ 14,607,000
Investment, cost method												$ 551,000
Percentage of equity interest sold												15.00%
Proceeds from sale of equity method investments												$ 827,000
Other assets
Summary of investments
Investments, equity method												13,200,000			14,600,000
Donghai County Dongfang High Purity Electronic Materials Co., Ltd Investment
Summary of investments
Investments, equity method												$ 1,716,000			1,887,000
Percentage of ownership, equity method												46.00%
Beijing JiYa Semiconductor Material Co., Ltd Investment
Summary of investments
Investments, equity method												$ 4,004,000			6,381,000
Percentage of ownership, equity method												39.00%
Dividends received				$ 1,800,000		$ 125,000
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												$ 4,904,000			5,094,000
Percentage of ownership, equity method												25.00%
Dividends received				$ 1,800,000			$ 1,500,000
ChaoYang KaiMei Quartz Co., Ltd
Summary of investments
Investments, equity method		$ 600,000			$ 900,000							$ 2,577,000		$ 600,000	827,000	$ 3,000,000.0
Percentage of ownership, equity method		40.00%										40.00%		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%									10.00%
Percentage of ownership, cost method			10.00%									10.00%
Percentage of equity interest sold			15.00%									15.00%
Proceeds from sale of equity method investments			$ 827,000
Gain from share sale			575,000									$ 575,000
Gain from fair value adjustment												$ 383,000
Nanjing JinMei Gallium Co., Ltd Investment
Summary of investments
Percentage of outstanding shares										8.50%			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 ownership, consolidated method (in hundredths)										67.00%			67.00%					63.00%
Percentage of outstanding shares										33.00%			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
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												$ 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)											91.50%	85.50%							100.00%
Private equity ownership percentage											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			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 \| 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		$ 44,000	$ 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%