Summary of Significant Accounting Policies (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Costs and expenses:
Total share-based compensation	$ 3,472	$ 2,490	$ 2,327
Related income tax benefit	(1,054)	(794)	(726)
Decrease in net income	(2,418)	(1,696)	(1,601)
Cost of revenue [Member]
Costs and expenses:
Total share-based compensation	373	348	201
Research and development costs [Member]
Costs and expenses:
Total share-based compensation	396	323	230
Selling, general and administrative [Member]
Costs and expenses:
Total share-based compensation	$ 2,703	$ 1,819	$ 1,896