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Investments in Privately-Held Raw Material Companies - Gain (loss) on sale and remeasurement of equity method investments (Details) - USD ($) | 1 Months Ended | 6 Months Ended
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May 31, 2023 | Jun. 30, 2023
Schedule of Equity Method Investments [Line Items] |  |
Fair value of the retained investment in Emeishan Jia Mei High Purity Metals Co., Ltd. |  | $ 551,000
Percentage of equity interest sold |  | 15.00%
Emeishan Jia Mei High Purity Metals Co., Ltd Investment |  |
Schedule of Equity Method Investments [Line Items] |  |
Fair value of the consideration received |  | $ 779,000
Foreign income tax withholding |  | 48,000
Carrying value of 15% of Emeishan Jia Mei High Purity Metals Co., Ltd. |  | (252,000)
Gain recognized on sale of 15% of Emeishan Jia Mei High Purity Metals Co., Ltd. | $ 575,000 | 575,000
Fair value of the retained investment in Emeishan Jia Mei High Purity Metals Co., Ltd. |  | 551,000
Carrying value of retained noncontrolling investment (10%) |  | (168,000)
Gain on retained noncontrolling investment due to remeasurement (10%) |  | $ 383,000
Percentage of equity interest sold | 15.00% | 15.00%
Percentage of ownership, cost method | 10.00% | 10.00%

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