Condensed Consolidated Statements of Operations (Unaudited) - USD ($)	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement [Abstract]
REVENUES	$ 7,501,000	$ 8,071,000	$ 20,919,000	$ 23,748,000
Type of Revenue [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Costs and expenses:
Manufacturing cost of sales	$ 4,782,000	$ 5,203,000	$ 13,334,000	$ 15,681,000
Engineering, selling and administrative	3,465,000	2,159,000	7,775,000	6,514,000
OPERATING (LOSS) INCOME	(746,000)	709,000	(190,000)	1,553,000
Other (expense) income:
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), net	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
Income tax expense	9,049,000	171,000	9,080,000	282,000
NET INCOME	$ 31,780,000	$ 629,000	$ 31,789,000	$ 1,067,000
Basic per share information:
Weighted average shares outstanding	5,273,786	5,212,652	5,273,263	5,159,452
Net income	$ 6.03	$ 0.12	$ 6.03	$ 0.21
Diluted per share information:
Weighted average shares outstanding	5,325,815	5,251,078	5,334,534	5,195,754
Net income	$ 5.97	$ 0.12	$ 5.96	$ 0.21

The aggregate total costs related to engineering a product design and manufacture, selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc.

No definition available.