Segment Information - Schedule of Reportable Business Segment (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Revenues from Operations
Revenues from operations	$ 28,140,000	$ 31,162,000
Operating (Loss) Income from Operations
Consolidated total operating (loss) income	(786,000)	1,415,000
Interest expense, net	(11,000)	(11,000)
Gain (loss) on equity investment in unconsolidated subsidiary	59,453,000	(262,000)
Realized (loss) income on marketable securities	(16,962,000)	74,000
Unrealized (loss) gain on marketable securities	(22,949,000)	139,000
Other income (expense), net	11,000	(51,000)
Total other income (expense), net	19,542,000	(111,000)
INCOME BEFORE INCOME TAXES	18,756,000	1,304,000
Capital Expenditures
Total capital expenditures	1,099,000	407,000
Total Assets
Total assets	59,906,000	43,455,000
Unallocated corporate expense [Member]
Operating (Loss) Income from Operations
Consolidated total operating (loss) income	(3,328,000)	(1,514,000)
Total Assets
Total assets	42,746,000	27,335,000
Electronic components [Member]
Revenues from Operations
Revenues from operations	26,694,000	29,980,000
Electronic components [Member] | Reportable Segment [Member]
Operating (Loss) Income from Operations
Consolidated total operating (loss) income	2,435,000	2,844,000
Capital Expenditures
Total capital expenditures	1,099,000	407,000
Total Assets
Total assets	15,900,000	15,014,000
Electronic instruments [Member]
Revenues from Operations
Revenues from operations	1,446,000	1,182,000
Electronic instruments [Member] | Reportable Segment [Member]
Operating (Loss) Income from Operations
Consolidated total operating (loss) income	107,000	85,000
Total Assets
Total assets	$ 1,260,000	$ 1,106,000