Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)	3 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Consolidated Statements of Comprehensive Income (Unaudited) [Abstract]
Net income	$ 1,910,000	$ 3,949,000
Other comprehensive income (loss), net of tax:
Unrealized (loss) gain on short-term investments (net of tax of $(4,000) and $7,000)	(6,000)	10,000
Foreign currency translation (loss) income	(349,000)	45,000
Total other comprehensive (loss) income, net of tax	(355,000)	55,000
Comprehensive income	$ 1,555,000	$ 4,004,000