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Investments in Privately-Held Raw Material Companies - Minority Investment Entities (Details) - Five Minority Investments - USD ($) | 3 Months Ended | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Summarized income information of all the minority investment entities that are not consolidated and accounted for under the equity method [Abstract] |  |  |  |
Net revenue | $ 3,605,000 | $ 4,559,000 | $ 7,558,000 | $ 11,000,000
Gross profit (loss) | 958,000 | 1,165,000 | 2,026,000 | 1,114,000
Operating (loss) | 265,000 | 618,000 | 462,000 | (1,421,000)
Net income (loss) | (160,000) | 430,000 | (158,000) | (2,016,000)
Minority investment entities |  |  |  |
Entity portion of loss from unconsolidated equity method investments, including impairment charges | $ 168,000 | $ 8,000 | $ 300,000 | $ 1,600,000

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