CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Net revenues:
Product	$ 20,170	$ 21,710
Service	15,379	15,644
Contract	20,044	16,822
Revenue, Net	55,593	54,176
Costs of sales:
Product	10,977	13,171
Service	10,565	10,707
Contract	18,983	15,809
Cost of goods and services sold	40,525	39,687
Gross margin	15,068	14,489
Operating expenses:
Selling, general and administrative	10,143	9,338
Research and development	3,549	3,743
Amortization of identifiable intangible assets	153	205
Operating expenses	13,845	13,286
Operating income (loss) from continuing operations	1,223	1,203
Other income, net	573	28
Interest expense	(21)	(48)
Income (loss) from continuing operations before provision for income taxes	1,775	1,183
Benefit (provision) benefit for income taxes	(740)	(442)
Income (loss) from continuing operations	1,035	741
Discontinued Operations [Abstract]
Income (loss) on discontinued operations (net of tax)	1,430	(337)
Net income (loss)	$ 2,465	$ 404
Basic earnings (loss) per share:
Income (loss) from continuing operations	$ 0.07	$ 0.05
Income (loss) from discontinued operations	$ 0.09	$ (0.02)
Net income (loss)	$ 0.16	$ 0.03
Diluted earnings (loss) per share:
Income (loss) from continuing operations	$ 0.07	$ 0.05
Income (loss) from discontinued operations	$ 0.09	$ (0.02)
Net income (loss)	$ 0.16	$ 0.03
Weighted average shares outstanding
Basic	15,083	14,924
Diluted	15,162	15,058