Consolidated Condensed Statements Of Operations (USD $) In Thousands, except Per Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Consolidated Condensed Statements Of Operations [Abstract]
Sales, net	$ 13,873	$ 14,727	$ 41,584	$ 44,215
Cost of sales	10,789	10,912	32,261	32,693
Gross profit	3,084	3,815	9,323	11,522
Operating expenses:
Sales and marketing	734	751	2,422	2,373
General and administrative	1,486	1,398	4,382	4,335
Research and development	1,326	1,231	3,600	3,455
Total operating expenses	3,546	3,380	10,404	10,163
Operating income (loss)	(462)	435	(1,081)	1,359
Interest expense	(144)	(158)	(431)	(500)
Equity in income (loss) of partnerships	(12)	54	317	42
Other (expense) income	69	(57)	32	29
Income (loss) from continuing operations before income taxes and discontinued operations	(549)	274	(1,163)	930
Income tax expense (benefit)	(60)	31	(90)	106
Income (loss) before discontinued operations	(489)	243	(1,073)	824
Loss from discontinued operations, net of income taxes				(329)
Gain on sale of discontinued operations, net of income taxes				35
Net income (loss)	$ (489)	$ 243	$ (1,073)	$ 530
Basic income (loss) per share:
Continuing operations	$ (0.09)	$ 0.04	$ (0.19)	$ 0.15
Discontinued operations	$ 0.00	$ 0.00	$ 0.00	$ (0.05)
Net income (loss)	$ (0.09)	$ 0.04	$ (0.19)	$ 0.10
Diluted income (loss) per share:
Continuing operations	$ (0.09)	$ 0.04	$ (0.19)	$ 0.15
Discontinued operations	$ 0.00	$ 0.00	$ 0.00	$ (0.05)
Net income (loss)	$ (0.09)	$ 0.04	$ (0.19)	$ 0.10
Average shares outstanding:
Basic	5,600	5,485	5,576	5,477
Diluted	5,600	5,614	5,576	5,540