Statements of Comprehensive Income (Unaudited) - USD ($)	3 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Net income	$ 3,945,049	$ 3,297,615
Unrealized (loss) gain from marketable securities, net of tax	(107,027)	55,027
Comprehensive income	$ 3,838,022	$ 3,352,642