Statements of Comprehensive Income (USD $)	3 Months Ended		9 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Comprehensive Income [Abstract]
Net income	$ 2,792,906	$ 2,777,174	$ 10,705,638	$ 8,573,650
Unrealized loss from marketable securities, net of tax	(41,941)	(151,829)	(351,824)	(762,475)
Comprehensive income	$ 2,750,965	$ 2,625,345	$ 10,353,814	$ 7,811,175