Summary of Significant Accounting Policies (Details) (USD $)	3 Months Ended		6 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Stock-based compensation expense
Increase in cash provided by operating activities over prior period			$ 600,000
Costs and expenses:
Total share-based compensation	867,000	584,000	1,657,000	1,125,000
Income tax benefit	(200,000)	(200,000)	(500,000)	(400,000)
Cost of revenue [Member]
Costs and expenses:
Total share-based compensation	92,000	89,000	178,000	163,000
Research and development costs [Member]
Costs and expenses:
Total share-based compensation	97,000	89,000	180,000	131,000
Selling, general and administrative [Member]
Costs and expenses:
Total share-based compensation	$ 678,000	$ 406,000	$ 1,299,000	$ 831,000