Summary of Significant Accounting Policies (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Costs and expenses:
Total share-based compensation	$ 2,327	$ 3,321	$ 3,748
Amounts capitalized in software development costs	0	0	2
Amounts charged against earnings, before income tax benefit	2,327	3,321	3,746
Related income tax benefit	(726)	(1,236)	(1,343)
Decrease in net income	(1,601)	(2,085)	(2,403)
Cost of revenue [Member]
Costs and expenses:
Total share-based compensation	201	261	272
Research and development costs [Member]
Costs and expenses:
Total share-based compensation	230	184	152
Selling, general and administrative [Member]
Costs and expenses:
Total share-based compensation	$ 1,896	$ 2,876	$ 3,324