Condensed Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Statement [Abstract]
Sales, net	$ 13,656	$ 10,762	$ 25,402	$ 18,142
Expenses
Cost of products	7,771	6,268	14,681	11,411
Selling, general and administrative	4,554	3,521	8,644	6,964
Total expenses	12,325	9,789	23,325	18,375
Operating income (loss)	1,331	973	2,077	(233)
Other income (expense):
Interest income	19	10	35	18
(Loss) gain on investment in securities	(55)	617	(1,201)	617
Loss on disposal of property, plant and equipment	0	0	0	(104)
Other expense	(58)	(60)	(225)	(147)
Total other income (expense)	(94)	567	(1,391)	384
Income before income taxes	1,237	1,540	686	151
Income tax expense	(290)	(222)	(183)	(101)
Net income	$ 947	$ 1,318	$ 503	$ 50
Net earnings per share-basic	$ 0.07	$ 0.1	$ 0.04	$ 0
Net earnings per share-diluted	$ 0.07	$ 0.1	$ 0.04	$ 0
Weighted average shares outstanding-basic	13,532,958	13,785,046	13,567,778	13,759,732
Weighted average shares outstanding-diluted	13,547,394	13,814,690	13,595,586	13,902,587