Condensed Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Statement [Abstract]
Sales, net	$ 13,294	$ 13,656	$ 20,938	$ 25,402
Expenses
Cost of products	7,593	7,771	12,800	14,681
Selling, general and administrative	5,681	4,554	10,436	8,644
Total expenses	13,274	12,325	23,236	23,325
Operating income (loss)	20	1,331	(2,298)	2,077
Other income (expense):
Net interest income	46	19	101	35
(Loss) gain on investment in securities	(148)	(55)	444	(1,201)
Other expense	(11)	(58)	(13)	(225)
Total other (expense) income	(113)	(94)	532	(1,391)
(Loss) income before income taxes	(93)	1,237	(1,766)	686
Income tax (expense) benefit	(154)	(290)	201	(183)
Net (loss) income	$ (247)	$ 947	$ (1,565)	$ 503
Net (loss) income per share-basic and diluted	$ (0.02)	$ 0.07	$ (0.12)	$ 0.04
Weighted average shares outstanding-basic	12,720,112	13,532,958	12,740,798	13,567,778
Weighted average shares outstanding-diluted	12,720,112	13,547,394	12,740,798	13,595,586