Consolidated Condensed Statements Of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Consolidated Condensed Statements Of Operations [Abstract]
Sales, net	$ 17,341	$ 17,005	$ 51,063	$ 51,822
Cost of sales	12,706	12,529	37,515	37,801
Gross profit	4,635	4,476	13,548	14,021
Operating expenses:
Sales and marketing	854	917	2,739	2,815
General and administrative	1,708	1,647	5,150	4,887
Research and development	1,344	1,214	3,864	3,530
Restructuring charges (note 3)				83
Total operating expenses	3,906	3,778	11,753	11,315
Operating income	729	698	1,795	2,706
Interest expense	(95)	(99)	(287)	(362)
Other income (expense)	(131)	27	17	(35)
Income from continuing operations before income taxes and discontinued operations	503	626	1,525	2,309
Income tax (benefit) expense	(125)	68	107	151
Income before discontinued operations	$ 628	$ 558	$ 1,418	2,158
Loss on sale of discontinued operations (note 4)				(120)
Loss from discontinued operations, net of income taxes				(150)
Net income	$ 628	$ 558	$ 1,418	$ 1,888
Basic income (loss) per share:
Continuing operations	$ 0.11	$ 0.10	$ 0.24	$ 0.37
Discontinued operations				(0.05)
Net income per share:	0.11	0.10	0.24	0.33
Diluted income (loss) per share:
Continuing operations	0.10	0.09	0.23	0.36
Discontinued operations				(0.04)
Net income per share	$ 0.10	$ 0.09	$ 0.23	$ 0.31
Average shares outstanding:
Basic	5,943	5,820	5,873	5,777
Diluted	6,210	6,148	6,214	6,037