Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Net sales and contract revenues:
Net sales	$ 27,679	$ 28,208	$ 25,341
Contract revenues	30,727	23,758	26,413
Total net sales and contract revenues	58,406	51,966	51,754
Costs of net sales and contract revenues:
Cost of net sales	13,393	13,447	12,313
Cost of contract revenues	21,942	15,635	17,399
Gross profit	23,071	22,884	22,042
Operating expenses:
Selling, general and administrative	17,986	16,981	15,709
Research and development	3,183	2,444	2,646
Amortization of intangible assets	504	176	113
Change in fair value of contingent acquisition consideration	(619)	55
Impairment of goodwill		7,970
Total operating expenses	21,054	27,626	18,468
Operating income (loss)	2,017	(4,742)	3,574
Non-operating income (expense):
Other income, net	4	18	44
Interest expense, net	(72)	(152)	(264)
Income (loss) from continuing operations before income taxes	1,949	(4,876)	3,354
Provision for income taxes	(643)	(278)	(960)
Income (loss) from continuing operations	1,306	(5,154)	2,394
Gain on sale of discontinued operation, net of tax	1,180
Income (loss) from discontinued operation, net of tax	28	(55)	(191)
Net income (loss)	$ 2,514	$ (5,209)	$ 2,203
Income (loss) per share from continuing operations - basic and diluted (in dollars per share)	$ 0.04	$ (0.15)	$ 0.07
Gain per share from sale of discontinued operation - basic and diluted (in dollars per share)	$ 0.03	$ 0.00	$ 0.00
Income (loss) per share from discontinued operation - basic and diluted (in dollars per share)	$ 0.00	$ 0.00	$ (0.01)
Net income (loss) per share - basic and diluted (in dollars per share)	$ 0.07	$ (0.15)	$ 0.06
Shares used in basic per share calculations (in shares)	34,259	34,335	34,249
Shares used in diluted per share calculations (in shares)	34,380	34,335	34,435