Statements of Comprehensive Income (Unaudited) - USD ($)	3 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Net income	$ 3,132,545	$ 3,803,226
Unrealized gain (loss) from marketable securities, net of tax	225,603	(308,499)
Comprehensive income	$ 3,358,148	$ 3,494,727