Quarterly Financial Data (Unaudited) - Summary of Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2022	Dec. 31, 2021
Quarterly Financial Information Disclosure [Abstract]
REVENUES	$ 524	$ 344	$ 370	$ 417	$ 361	$ 328	$ 475	$ 282	$ 1,655	$ 1,446
Type of Revenue [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Costs and expenses:
Manufacturing cost of sales	$ 165	$ 203	$ 227	$ 242	$ 215	$ 146	$ 206	$ 144	$ 837	$ 711
Engineering, selling and administrative	551	669	623	1,022	1,065	1,907	612	672	2,865	4,256
OPERATING (LOSS)	(192)	(528)	(480)	(847)	(919)	(1,725)	(343)	(534)	(2,047)	(3,521)
Other income (expense):
Interest (Expense) Income, net	137	52	9	(4)	1				194	1
(Loss) gain on Equity Investment in Unconsolidated Subsidiary						60,205	(676)	(76)		59,453
Investment Income (Loss)	(79)	(2,121)	(2,373)	45	(21,246)	(18,867)	75	127
Other Income (Expense), Net	(29)	2	1	1	(259)	258	2	(1)	(25)
Total other (expense) income, net	29	(2,067)	(2,363)	42	(21,504)	41,596	(599)	50	(4,359)	19,543
(LOSS) INCOME BEFORE INCOME TAXES FOR CONTINUING OPERATIONS	(163)	(2,595)	(2,843)	(805)	(22,423)	39,871	(942)	(484)	(6,406)	16,022
Income Tax (Benefit) Provision	(164)	(611)	(588)	(166)	(5,036)	8,823	(199)	(116)	(1,529)	3,472
Net (loss) income from continuing operations	1	(1,984)	(2,255)	(639)	(17,387)	31,048	(743)	(368)	(4,877)	12,550
Income From Discontinued Operations, Net of Tax	132	488	457	808	236	732	725	395	1,885	2,088
NET (LOSS) INCOME	$ 133	$ (1,496)	$ (1,798)	$ 169	$ (17,151)	$ 31,780	$ (18)	$ 27	$ (2,992)	$ 14,638
Net Income (Loss) per Basic Share:
Continuing Operations	$ 0.00	$ (0.37)	$ (0.42)	$ (0.12)	$ (3.29)	$ 5.89	$ (0.14)	$ (0.07)	$ (0.91)	$ 2.38
Discontinued Operations	0.02	0.09	0.09	0.15	0.04	0.14	0.14	0.07	0.35	0.40
Total Net Income (Loss) per Basic Share	0.02	(0.28)	(0.34)	0.03	(3.25)	6.03		0.01	(0.56)	2.77
Net Income (Loss) per Diluted Share:
Continuing Operations	0.00	(0.37)	(0.42)	(0.12)	(3.29)	5.83	(0.14)	(0.07)	(0.91)	2.35
Discontinued Operations	0.02	0.09	0.09	0.15	0.04	0.14	$ 0.14	0.07	0.35	0.39
Total Net Income (Loss) per Diluted Share	$ 0.02	$ (0.28)	$ (0.34)	$ 0.03	$ (3.25)	$ 5.97		$ 0.01	$ (0.56)	$ 2.74
Weighted average shares outstanding:
Basic	5,349,187	5,346,043	5,334,187	5,323,973	5,281,630	5,273,786	5,272,204	5,272,204	5,338,417	5,275,374
Dilutive	5,356,188	5,346,043	5,334,187	5,345,202	5,281,630	5,325,815	5,272,204	5,350,571	5,383,666	5,334,087