Consolidated Condensed Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Consolidated Condensed Statements Of Operations [Abstract]
Sales, net	$ 11,479	$ 14,943	$ 25,605	$ 30,296
Cost of sales	9,617	11,174	19,974	22,227
Gross profit	1,862	3,769	5,631	8,069
Operating expenses:
Sales and marketing	731	754	1,623	1,629
General and administrative	1,367	1,435	2,927	2,889
Research and development	1,249	1,078	2,478	2,161
Restructuring charges (note 3)	199		199
Total operating expenses	3,546	3,267	7,227	6,679
Operating income (loss)	(1,684)	502	(1,596)	1,390
Interest expense	(154)	(180)	(307)	(359)
Equity in (loss) of partnerships	(77)	(13)	(135)	(37)
Other income (expense)	(7)	(9)	83	(57)
Income (loss) from continuing operations before income taxes and discontinued operations	(1,922)	300	(1,955)	937
Income tax expense	48	57	38	91
Income (loss) before discontinued operations	(1,970)	243	(1,993)	846
Loss from discontinued operations (note 4)	(1,473)	(325)	(1,921)	(685)
Net income (loss)	$ (3,443)	$ (82)	$ (3,914)	$ 161
Basic income (loss) per share:
Continuing operations	$ (0.34)	$ 0.04	$ (0.35)	$ 0.15
Discontinued operations	$ (0.26)	$ (0.05)	$ (0.34)	$ (0.12)
Net income (loss) per share:	$ (0.60)	$ (0.01)	$ (0.69)	$ 0.03
Diluted income (loss) per share:
Continuing operations	$ (0.34)	$ 0.04	$ (0.35)	$ 0.14
Discontinued operations	$ (0.26)	$ (0.05)	$ (0.34)	$ (0.11)
Net income (loss) per share:	$ (0.60)	$ (0.01)	$ (0.69)	$ 0.03
Average shares outstanding:
Basic	5,694	5,670	5,691	5,662
Diluted	5,694	5,670	5,691	5,939