Consolidated Statements of Comprehensive Income (Unaudited) (USD $)	3 Months Ended		6 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Consolidated Statements of Comprehensive Income (Unaudited) [Abstract]
Net income	$ 1,475,000	$ 2,164,000	$ 5,424,000	$ 103,144,000
Other comprehensive (loss) income, net of tax:
Unrealized (loss) gain on short-term investments (net of tax of $(2,000), $9,000, $5,000 and $10,000)	(3,000)	14,000	7,000	14,000
Foreign currency translation loss	(513,000)	(24,000)	(468,000)	(12,000)
Total other comprehensive (loss) income, net of tax	(516,000)	(10,000)	(461,000)	2,000
Comprehensive income	$ 959,000	$ 2,154,000	$ 4,963,000	$ 103,146,000