Statements of Comprehensive Income (Unaudited) - USD ($)	3 Months Ended		9 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Net income	$ 3,421,405	$ 3,571,602	$ 11,649,064	$ 10,030,252
Unrealized gain (loss) from marketable securities, net of tax	101,891	(295,458)	46,101	(227,693)
Comprehensive income	$ 3,523,296	$ 3,276,144	$ 11,695,165	$ 9,802,559