Statements of Comprehensive Income (USD $)	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Comprehensive Income [Abstract]
Net income	$ 11,135,875	$ 11,828,838	$ 11,381,095
Unrealized (gain) loss from marketable securities, net of tax	(679,869)	470,270	27,018
Comprehensive income	$ 10,456,006	$ 12,299,108	$ 11,408,113