Summary of Significant Accounting Policies (Tables)

12 Months Ended

Mar. 31, 2017

Accounting Policies [Abstract]

Schedule of comprehensive income

	March 31,
	2017		2016		2015
Net income	$	23,819	$	20,567	$	17,453
Net change in unrealized gain (loss) on short term investments		-		54		(17	)
Comprehensive income	$	23,819	$	20,621	$	17,436