CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Net sales and contract revenues:
Net product sales and contract revenues	$ 19,141	$ 23,251
Net service revenues	12,303	12,286
Total net sales and contract revenues	31,444	35,537
Cost of sales and contracts:
Cost of product sales and contracts	10,620	12,298
Cost of service revenues	6,398	6,770
Total cost of sales and contracts	17,018	19,068
Gross profit	14,426	16,469
Expenses:
Selling, general and administrative expenses	8,270	8,191
Research and development costs	6,889	6,006
Total operating expenses	15,159	14,197
Operating income (loss)	(733)	2,272
Other income (expense):
Interest and investment income	34	78
Interest expense		(10)
Other expense, net	(93)	(153)
Total other income (expense)	(59)	(85)
Income (loss) before provision for (benefit from) income taxes	(792)	2,187
Provision for (benefit from) income taxes	(277)	733
Net income (loss)	(515)	1,454
Other comprehensive income (loss):
Unrealized gain (loss) on available for sale securities (net of tax)	1	(14)
Comprehensive income (loss)	$ (514)	$ 1,440
Income (loss) per share - Basic (in dollars per share)	$ (0.07)	$ 0.18
Income (loss) per share - Diluted (in dollars per share)	$ (0.07)	$ 0.18
Weighted average shares - Basic (in shares)	7,161	7,891
Weighted average shares - Diluted (in shares)	7,161	7,913