Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Income Statement [Abstract]
Sales, net	$ 49,380	$ 39,395
Expenses
Cost of products	29,403	29,845
Selling, general and administrative	17,552	14,577
Total expenses	46,955	44,422
Operating income (loss)	2,425	(5,027)
Other income (expense):
Interest income	102	46
(Loss) gain on investment in securities	(2,671)	1,833
Legal settlement	0	(1,436)
Loss on disposal of property, plant and equipment	0	(95)
Other expense	(328)	(106)
Total other (expense) income	(2,897)	242
Loss before income taxes	(472)	(4,785)
Discrete tax item-impact of tax reform	0	(665)
Income tax benefit	277	1,824
Net loss	$ (195)	$ (3,626)
Net loss per share-basic	$ (0.01)	$ (0.27)
Net loss per share-diluted	$ (0.01)	$ (0.27)
Weighted average shares outstanding-basic	13,464	13,625
Weighted average shares outstanding-diluted	13,464	13,625