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Segment Information - Schedule of Reportable Business Segment (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Revenues from Operations |  |  |  |
Revenues from operations | $ 7,501,000 | $ 8,071,000 | $ 20,919,000 | $ 23,748,000
Operating (Loss) Income |  |  |  |
Total operating (loss) income | (746,000) | 709,000 | (190,000) | 1,553,000
Interest expense, net | (3,000) | (3,000) | (9,000) | (7,000)
Gain (loss) on equity investment in unconsolidated subsidiary | 60,205,000 | (61,000) | 59,453,000 | (200,000)
Unrealized (loss) gain on marketable securities | (18,867,000) | 122,000 | (18,665,000) | 15,000
Other income (expense), net | 240,000 | 33,000 | 280,000 | (12,000)
Total other income (expense) | 41,575,000 | 91,000 | 41,059,000 | (204,000)
INCOME BEFORE INCOME TAXES | 40,829,000 | 800,000 | 40,869,000 | 1,349,000
Unallocated corporate expense [Member] |  |  |  |
Operating (Loss) Income |  |  |  |
Total operating (loss) income | (1,632,000) | (314,000) | (2,377,000) | (729,000)
Electronic components [Member] |  |  |  |
Revenues from Operations |  |  |  |
Revenues from operations | 7,173,000 | 7,860,000 | 19,834,000 | 22,905,000
Electronic components [Member] | Reportable Segment [Member] |  |  |  |
Operating (Loss) Income |  |  |  |
Total operating (loss) income | 854,000 | 1,064,000 | 2,037,000 | 2,249,000
Electronic instruments [Member] |  |  |  |
Revenues from Operations |  |  |  |
Revenues from operations | 328,000 | 211,000 | 1,085,000 | 843,000
Electronic instruments [Member] | Reportable Segment [Member] |  |  |  |
Operating (Loss) Income |  |  |  |
Total operating (loss) income | $ 32,000 | $ (41,000) | $ 150,000 | $ 33,000

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