Consolidated Condensed Statements Of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Consolidated Condensed Statements Of Operations [Abstract]
Sales, net	$ 17,120	$ 17,507	$ 33,722	$ 34,817
Cost of sales	12,535	12,735	24,809	25,272
Gross profit	4,585	4,772	8,913	9,545
Operating expenses:
Sales and marketing	898	891	1,885	1,898
General and administrative	1,733	1,616	3,442	3,240
Research and development	1,294	1,148	2,520	2,316
Restructuring charges (note 3)				83
Total operating expenses	3,925	3,655	7,847	7,537
Operating income	660	1,117	1,066	2,008
Interest expense	(89)	(125)	(192)	(263)
Other income (expense)	12	(122)	148	(62)
Income from continuing operations before income taxes and discontinued operations	583	870	1,022	1,683
Income tax expense	77	57	232	83
Income before discontinued operations	$ 506	$ 813	$ 790	1,600
Loss on sale of discontinued operations (note 4)				(120)
Loss from discontinued operations, net of income taxes				(150)
Net income	$ 506	$ 813	$ 790	$ 1,330
Basic income (loss) per share:
Continuing operations	$ 0.09	$ 0.14	$ 0.14	$ 0.28
Discontinued operations				(0.05)
Net income per share:	0.09	0.14	0.14	0.23
Diluted income (loss) per share:
Continuing operations	0.08	0.13	0.13	0.27
Discontinued operations				(0.05)
Net income per share	$ 0.08	$ 0.13	$ 0.13	$ 0.22
Average shares outstanding:
Basic	5,856	5,780	5,848	5,754
Diluted	6,242	6,081	6,229	5,973