Condensed Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Sales, net	$ 10,889	$ 7,644
Expenses
Cost of products	6,994	5,207
Selling, general and administrative	4,743	4,755
Total expenses	11,737	9,962
Operating loss	(848)	(2,318)
Other (expense) income:
Net interest income	9	55
(Loss) gain on investment in securities	(306)	592
Other expense	(47)	(2)
Total other (expense) income	(344)	645
Loss before income taxes	(1,192)	(1,673)
Income tax benefit (expense)	0	355
Net loss	$ (1,192)	$ (1,318)
Net loss per share-basic and diluted	$ (0.09)	$ (0.10)
Weighted average shares outstanding-basic	12,555,108	12,761,713
Weighted average shares outstanding-diluted	12,555,108	12,761,713