Condensed Consolidated Statements of Income (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]
Sales, net	$ 9,937	$ 13,294	$ 20,826	$ 20,938
Expenses
Cost of products	5,609	7,593	12,603	12,800
Selling, general and administrative	4,364	5,681	9,107	10,436
Total expenses	9,973	13,274	21,710	23,236
Operating loss	(36)	20	(884)	(2,298)
Other (expense) income:
Net interest (expense) income	(6)	46	3	101
(Loss) gain on investment in securities	(200)	(148)	(506)	444
Other expense	(32)	(11)	(79)	(13)
Total other (expense) income	(238)	(113)	(582)	532
Loss before income taxes	(274)	(93)	(1,466)	(1,766)
Income tax benefit (expense)	(28)	(154)	(28)	201
Net loss	$ (302)	$ (247)	$ (1,494)	$ (1,565)
Net loss per share-basic and diluted	$ (0.02)	$ (0.02)	$ (0.12)	$ (0.12)
Weighted average shares outstanding-basic	12,495,707	12,720,112	12,525,407	12,740,798
Weighted average shares outstanding-diluted	12,495,707	12,720,112	12,525,407	12,740,798