Consolidated Condensed Statements Of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Consolidated Condensed Statements Of Operations [Abstract]
Revenue, net	$ 26,893	$ 29,566	$ 85,800	$ 83,590
Cost of goods sold	20,120	20,236	62,253	56,435
Gross profit	6,773	9,330	23,547	27,155
Operating expenses:
Sales and marketing	2,609	2,784	9,071	8,023
General and administrative	3,715	2,921	10,551	8,429
Research and development	840	1,251	2,902	3,693
Impairment loss (Note 10)			3,765
Total operating expenses	7,164	6,956	26,289	20,145
Operating income (loss)	(391)	2,374	(2,742)	7,010
Interest income (expense), net	240	(48)	703	(453)
Other expense, net	(52)	(221)	(458)	(650)
Income (loss) from continuing operations before income taxes and discontinued operations	(203)	2,105	(2,497)	5,907
Income tax expense (benefit)	87	(97)	334	358
Income (loss) from continuing operations before discontinued operations	(290)	2,202	(2,831)	5,549
Loss on disposal of discontinued operations (Note 3)			(1,116)
Loss from discontinued operations, net of income taxes (Note 3)		(299)	(597)	(870)
Net income (loss)	$ (290)	$ 1,903	$ (4,544)	$ 4,679
Basic income (loss) per share:
Continuing operations	$ (0.03)	$ 0.28	$ (0.32)	$ 0.77
Discontinued operations		(0.04)	(0.20)	(0.12)
Net income (loss) per share:	(0.03)	0.24	(0.52)	0.65
Diluted income (loss) per share:
Continuing operations	(0.03)	0.25	(0.32)	0.66
Discontinued operations		(0.03)	(0.20)	(0.10)
Net income (loss) per share:	$ (0.03)	$ 0.22	$ (0.52)	$ 0.56
Average shares outstanding:
Basic	8,764	7,825	8,738	7,249
Diluted	8,764	8,822	8,738	8,360