Statements of Comprehensive Income (USD $)	3 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Comprehensive Income [Abstract]
Net income	$ 4,037,110	$ 2,566,825
Unrealized loss from marketable securities, net of tax	94,848	(855,035)
Comprehensive income	$ 4,131,958	$ 1,711,790