Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
REVENUES	$ 7,059	$ 7,838	$ 15,677	$ 14,470
Type of Revenue [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Costs and expenses:
Manufacturing cost of sales	$ 4,816	$ 4,706	$ 10,478	$ 8,921
Engineering, selling and administrative	2,059	2,276	4,355	4,259
OPERATING INCOME	184	856	844	1,290
Other income (expense):
Interest (expense) income, net	(4)		(4)	1
Loss on equity investment in unconsolidated subsidiary	(100)		(139)
Other income (expense), net	232	117	(152)	270
Total other income (expense), net	128	117	(295)	271
INCOME BEFORE INCOME TAXES	312	973	549	1,561
Income tax expense	57	34	111	40
NET INCOME	$ 255	$ 939	$ 438	$ 1,521
Basic per share information:
Weighted average shares outstanding	5,211,773	4,888,059	5,132,414	4,857,603
Net income	$ 0.05	$ 0.19	$ 0.09	$ 0.31
Diluted per share information:
Weighted average shares outstanding	5,245,162	4,972,418	5,170,740	4,962,110
Net income	$ 0.05	$ 0.19	$ 0.08	$ 0.31