Condensed Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement [Abstract]
Sales, net	$ 12,760	$ 11,805	$ 33,586	$ 32,743
Expenses
Cost of products	7,560	6,699	20,163	19,499
Selling, general and administrative	4,158	4,811	13,265	15,247
Total expenses	11,718	11,510	33,428	34,746
Operating income (loss)	1,042	295	158	(2,003)
Other (expense) income:
Net interest (expense) income	(6)	33	(4)	134
(Loss) gain on investment in securities	(291)	(258)	(797)	186
Other expense	(65)	(85)	(144)	(98)
Total other (expense) income	(362)	(310)	(945)	222
Income (loss) before income taxes	680	(15)	(787)	(1,781)
Income tax (expense) benefit	(2)	253	(30)	454
Net income (loss)	$ 678	$ 238	$ (817)	$ (1,327)
Net loss per share-basic and diluted	$ 0.05	$ 0.02	$ (0.07)	$ (0.1)
Weighted average shares outstanding-basic	12,505,096	12,696,273	12,518,587	12,725,793
Weighted average shares outstanding-diluted	12,517,493	12,709,057	12,518,587	12,725,793