CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011
Statement of Income and Comprehensive Income [Abstract]
Net income	$ 1,920	$ 2,586	$ 12,278	$ 5,365
Other comprehensive income, net of tax
Unrealized gain (loss) on investment in securities	(44)	(8)	23	(15)
Comprehensive income	$ 1,876	$ 2,578	$ 12,301	$ 5,350