Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Income Statement [Abstract]
Sales, net	$ 40,100	$ 49,380
Expenses
Cost of products	24,449	29,403
Selling, general and administrative	20,036	17,552
Total expenses	44,485	46,955
Operating income (loss)	(4,385)	2,425
Other income (expense):
Interest income	150	102
Gain (loss) gain on investment in securities	716	(2,671)
Other expense	(104)	(328)
Total other income (expense)	762	(2,897)
Loss before income taxes	(3,623)	(472)
Income tax benefit	987	277
Net loss	$ (2,636)	$ (195)
Net loss per share-basic	$ (0.21)	$ (0.01)
Net loss per share-diluted	$ (0.21)	$ (0.01)
Weighted average shares outstanding-basic	12,705	13,464
Weighted average shares outstanding-diluted	12,705	13,464