Summary of Significant Accounting Policies (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Costs and expenses:
Total share-based compensation	$ 2,490	$ 2,327	$ 3,321
Related income tax benefit	(794)	(726)	(1,236)
Decrease in net income	(1,696)	(1,601)	(2,085)
Cost of revenue [Member]
Costs and expenses:
Total share-based compensation	348	201	261
Research and development costs [Member]
Costs and expenses:
Total share-based compensation	323	230	184
Selling, general and administrative [Member]
Costs and expenses:
Total share-based compensation	$ 1,819	$ 1,896	$ 2,876