CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME [Abstract]
Net income	$ 14,185	$ 27,459	$ 13,091
Other comprehensive income (loss):
Net change in unrealized gain (loss) on investments	(79)	29	41
Provision (benefit) for income taxes related to items of other comprehensive income	(32)	12	16
Other comprehensive income (loss), net of tax	(47)	17	25
Comprehensive income	$ 14,138	$ 27,476	$ 13,116