Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Income Statement [Abstract]
Sales, net	$ 39,395	$ 50,689
Expenses
Cost of products	29,845	33,612
Selling, general and administrative	14,577	12,792
Total expenses	44,422	46,404
Operating income (loss)	(5,027)	4,285
Other income (expense):
Interest income	46	9
Gain on sale of available-for-sale securities	1,833	0
Legal settlement	(1,436)	0
Loss on disposal of property, plant and equipment	(95)	0
Other expense	(106)	(22)
Total other income (expense)	242	(13)
Income (loss) before income taxes	(4,785)	4,272
Discrete tax item-impact of tax reform	(665)	0
Income tax expense	1,824	(1,583)
Net income (loss)	$ (3,626)	$ 2,689
Net income (loss) per share-basic	$ (0.27)	$ .20
Net income (loss) per share-diluted	$ (0.27)	$ 0.19
Weighted average shares outstanding-basic	13,625	13,735
Weighted average shares outstanding-diluted	13,625	13,823