Condensed Consolidated Statements of Operations (Unaudited) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Income Statement [Abstract]
REVENUES	$ 7,434,000	$ 6,882,000	$ 15,542,000	$ 13,418,000
Type of Revenue [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Costs and expenses:
Manufacturing cost of sales	$ 4,639,000	$ 4,151,000	$ 9,700,000	$ 8,552,000
Engineering, selling and administrative	2,671,000	2,115,000	5,497,000	4,310,000
OPERATING INCOME	124,000	616,000	345,000	556,000
Other income (expense):
Interest income (expense), net	7,000	(3,000)		(6,000)
Loss on equity investment in unconsolidated subsidiary		(676,000)		(752,000)
Investment (loss) income	(2,373,000)	75,000	(2,328,000)	202,000
Other (expense) income, net	(8,000)	(5,000)	(24,000)	40,000
Total other expense, net	(2,374,000)	(609,000)	(2,352,000)	(516,000)
(LOSS) INCOME BEFORE INCOME TAXES	(2,250,000)	7,000	(2,007,000)	40,000
Income tax (benefit) expense	(452,000)	25,000	(378,000)	31,000
NET (LOSS) INCOME	$ (1,798,000)	$ (18,000)	$ (1,629,000)	$ 9,000
Basic per share information:
Weighted average shares outstanding	5,334,187	5,272,204	5,329,080	5,272,204
Net (loss) income	$ (0.34)	$ 0.00	$ (0.31)	$ 0.00
Diluted per share information:
Weighted average shares outstanding	5,345,648	5,272,204	5,347,583	5,337,986
Net (loss) income	$ (0.34)	$ 0.00	$ (0.30)	$ 0.00