Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement [Abstract]
Net sales	$ 4,171	$ 5,278	$ 12,052	$ 14,797
Cost of goods sold	3,436	3,747	9,529	10,170
Gross profit	735	1,531	2,523	4,627
Operating expenses:
Selling	614	781	1,916	2,253
General and administrative	1,203	1,185	3,551	3,978
Research and development	600	848	1,865	2,291
Total operating expenses	2,417	2,814	7,332	8,522
Gain on building sale				7,175
(Loss) earnings from operations	(1,682)	(1,283)	(4,809)	3,280
Other Expense - net	(105)	(51)	(252)	(180)
(Loss) earnings before income taxes	(1,787)	(1,334)	(5,061)	3,100
Provision for income taxes
Net (loss) earnings	$ (1,787)	$ (1,334)	$ (5,061)	$ 3,100
Basic net (loss) earnings per share	$ (0.18)	$ (0.14)	$ (0.52)	$ 0.32
Diluted net (loss) earnings per share	$ (0.18)	$ (0.14)	$ (0.52)	$ 0.31
Basic weighted averages shares outstanding	9,771	9,631	9,767	9,583
Diluted weighted averages shares outstanding	9,771	9,631	9,767	9,971