Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
REVENUES	$ 441	$ 417
Costs and expenses:
Manufacturing cost of sales	192	242
Engineering, selling and administrative	558	1,022
OPERATING LOSS	(309)	(847)
Other income (expense):
Interest income (expense), net	198	(4)
Investment income	345	45
Other (expense) income, net	(12)	1
Total other income (expense), net	531	42
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	222	(805)
Income tax expense (benefit)	65	(166)
NET INCOME (LOSS) FROM CONTINUING OPERATIONS	157	(639)
Income From Discontinued Operations, net of Tax	0	808
NET INCOME	$ 157	$ 169
Net Income (Loss) per Basic Share:
Continuing Operations (in dollars per share)	$ 0.03	$ (0.12)
Discontinued Operations (in dollars per share)	0	0.15
Total Net Income per Basic Share (in dollars per share)	0.03	0.03
Net Income (Loss) per Diluted Share:
Continuing Operations (in dollars per share)	0.03	(0.12)
Discontinued Operations (in dollars per share)	0	0.15
Total Net Income per Diluted Share (in dollars per share)	$ 0.03	$ 0.03
Weighted average shares outstanding:
Basic (in shares)	5,352,937	5,323,973
Dilutive (in shares)	5,352,937	5,323,973