Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Consolidated Statements Of Operations [Abstract]
Sales, net	$ 56,058	$ 58,697	$ 51,676
Costs of sales	43,392	43,684	40,625
Gross profit	12,666	15,013	11,051
Operating expenses:
Sales and marketing	3,185	3,133	2,962
General and administrative	5,797	5,801	5,374
Research and development	4,876	4,485	3,345
Total operating expenses	13,858	13,419	11,681
Operating income (loss)	(1,192)	1,594	(630)
Interest expense	(609)	(655)	(836)
Equity in income (loss) of partnerships	174	(135)	(150)
Other income (expense), net	42	(4)	(220)
Income (loss) from continuing operations before income taxes and discontinued operations	(1,585)	800	(1,836)
Income tax (expense) benefit	160	(145)	34
Income (loss) before discontinued operations	(1,425)	655	(1,802)
Loss from discontinued operations, net of income taxes		(329)	(2,119)
Gain on sale of discontinued operations, net of income taxes		35
Net income (loss)	$ (1,425)	$ 361	$ (3,921)
Basic income (loss) per share:
Continuing operations	$ (0.25)	$ 0.12	$ (0.34)
Discontinued operations		$ (0.05)	$ (0.39)
Net income (loss)	$ (0.25)	$ 0.07	$ (0.73)
Diluted income (loss) per share:
Continuing operations	$ (0.25)	$ 0.12	$ (0.34)
Discontinued operations		$ (0.05)	$ (0.39)
Net income (loss)	$ (0.25)	$ 0.07	$ (0.73)