Condensed Consolidated Statements of Operations (Unaudited) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Income Statement [Abstract]
REVENUES	$ 8,761,000	$ 7,501,000	$ 24,303,000	$ 20,919,000
Type of Revenue [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Costs and expenses:
Manufacturing cost of sales	$ 5,891,000	$ 4,782,000	$ 15,591,000	$ 13,334,000
Engineering, selling and administrative	2,749,000	3,465,000	8,246,000	7,775,000
OPERATING INCOME (LOSS)	121,000	(746,000)	466,000	(190,000)
Other income (expense):
Interest income (expense), net	51,000	(3,000)	51,000	(9,000)
Gain on equity investment in unconsolidated subsidiary		60,205,000		59,453,000
Investment loss	(2,121,000)	(18,867,000)	(4,449,000)	(18,665,000)
Other (expense) income, net	(13,000)	240,000	(37,000)	280,000
Total other expense (income), net	(2,083,000)	41,575,000	(4,435,000)	41,059,000
(LOSS) INCOME BEFORE INCOME TAXES	(1,962,000)	40,829,000	(3,969,000)	40,869,000
Income tax (benefit) expense	(503,000)	9,049,000	(881,000)	9,080,000
NET (LOSS) INCOME	$ (1,459,000)	$ 31,780,000	$ (3,088,000)	$ 31,789,000
Basic per share information:
Weighted average shares outstanding	5,346,043	5,273,786	5,334,774	5,273,263
Net (loss) income	$ (0.27)	$ 6.03	$ (0.58)	$ 6.03
Diluted per share information:
Weighted average shares outstanding	5,346,043	5,325,815	5,334,774	5,334,534
Net (loss) income	$ (0.27)	$ 5.97	$ (0.58)	$ 5.96