Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)	3 Months Ended		9 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Consolidated Statements of Comprehensive Income (Unaudited) [Abstract]
Net income	$ 7,748,000	$ 2,927,000	$ 8,266,000	$ 8,351,000
Other comprehensive income (loss), net of tax:
Unrealized gain (loss) on short-term investments (net of tax of $29,000, $10,000, $(11,000), and $15,000)	42,000	15,000	(17,000)	22,000
Foreign currency translation loss	(422,000)	(338,000)	(2,195,000)	(806,000)
Total other comprehensive loss, net of tax	(380,000)	(323,000)	(2,212,000)	(784,000)
Comprehensive income	$ 7,368,000	$ 2,604,000	$ 6,054,000	$ 7,567,000