Income Taxes (Reconciliation of Taxes Provided to Federal Statutory Rate) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended										12 Months Ended
	Mar. 31, 2015		Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014		Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Income Taxes Reconciliation Of Taxes Provided To Federal Statutory Rate Details
Tax provision at statutory rate											$ 1,599	$ 1,285	$ 7,768
State income taxes before valuation allowance, net of federal effect											269	196	822
Research and development credits											(725)	(1,534)	(385)
Change in valuation allowance											(1,480)	1,264	1,038
Compensation/option differences											(331)	(264)	(207)
Non-deductible compensation											746	605	403
Acquisition costs											0	230	0
Expiring CA NOLs											1,484	240	0
Foreign loss not benefited											1,192	271	0
Other											35	(74)	(40)
Total income tax provision	$ 79	[1]	$ 627	$ 1,411	$ 672	$ 1,738	[1]	$ (1,306)	$ 826	$ 961	$ 2,789	$ 2,219	$ 9,399

[1] Comparability affected by the decrease in fiscal 2015 and increase in fiscal 2014 in the valuation allowance related to the deferred tax asset which resulted in a decrease in fiscal 2015 and an increase in the provision for income taxes of $1.5 million and $1.3 million in the fourth quarter of fiscal 2015 and 2014, respectively.