Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Net sales	$ 3,831	$ 5,437	$ 7,881	$ 9,519
Cost of goods sold	2,596	3,432	6,093	6,423
Gross profit	1,235	2,005	1,788	3,096
Operating expenses:
Selling	574	745	1,302	1,472
General and administrative	1,161	1,327	2,348	2,793
Research and development	608	778	1,265	1,443
Total operating expenses	2,343	2,850	4,915	5,708
Gain on building sale				7,175
(Loss) earnings from operations	(1,108)	(845)	(3,127)	4,563
Other Expense - net	(86)	(46)	(147)	(129)
(Loss) earnings before income taxes	(1,194)	(891)	(3,274)	4,434
Provision for income taxes
Net (loss) earnings	$ (1,194)	$ (891)	$ (3,274)	$ 4,434
Basic net (loss) earnings per share	$ (0.12)	$ (0.09)	$ (0.34)	$ 0.46
Diluted net (loss) earnings per share	$ (0.12)	$ (0.09)	$ (0.34)	$ 0.44
Basic weighted averages shares outstanding	9,766	9,611	9,766	9,558
Diluted weighted averages shares outstanding	9,766	9,611	9,766	10,065