Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Income Statement [Abstract]
Sales, net	$ 44,139	$ 40,100
Expenses
Cost of products	26,055	24,449
Selling, general and administrative	17,036	20,036
Total expenses	43,091	44,485
Operating income (loss)	1,048	(4,385)
Other income (expense):
Net interest (expense) income	(8)	150
(Loss) gain on investment in securities	(620)	716
Other (expense) income	(169)	(104)
Total other (expense) income	(797)	762
Income (loss) before income taxes	251	(3,623)
Income tax (expense) benefit	(3)	987
Net income (loss)	$ 248	$ (2,636)
Net income (loss) per share-basic	$ 0.02	$ (0.21)
Net income (loss) per share-diluted	$ 0.02	$ (0.21)
Weighted average shares outstanding-basic	12,553	12,705
Weighted average shares outstanding-diluted	12,561	12,705