Statements of Comprehensive Income (USD $)	3 Months Ended		6 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Comprehensive Income [Abstract]
Net income	$ 3,875,622	$ 3,229,651	$ 7,912,732	$ 5,796,476
Unrealized loss from marketable securities, net of tax	(404,731)	244,389	(309,883)	(610,646)
Comprehensive income	$ 3,470,891	$ 3,474,040	$ 7,602,849	$ 5,185,830