Condensed Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Statement [Abstract]
Sales, net	$ 11,805	$ 13,302	$ 32,743	$ 38,704
Expenses
Cost of products	6,699	7,839	19,499	22,519
Selling, general and administrative	4,811	4,585	15,247	13,229
Total expenses	11,510	12,424	34,746	35,748
Operating income (loss)	295	878	(2,003)	2,956
Other income (expense):
Net interest income	33	28	134	63
(Loss) gain on investment in securities	(258)	(191)	186	(1,392)
Other expense	(85)	(48)	(98)	(274)
Total other (expense) income	(310)	(211)	222	(1,603)
(Loss) income before income taxes	(15)	667	(1,781)	1,353
Income tax benefit (expense)	253	(17)	454	(200)
Net income (loss)	$ 238	$ 650	$ (1,327)	$ 1,153
Net income (loss) per share-basic and diluted	$ 0.02	$ 0.05	$ (0.10)	$ 0.09
Weighted average shares outstanding-basic	12,696,273	13,479,759	12,725,793	13,538,116
Weighted average shares outstanding-diluted	12,709,057	13,501,587	12,725,793	13,563,990