STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($)	3 Months Ended						9 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2022	Dec. 31, 2021
Details
Net income	$ 4,231,324	$ 6,090,373	$ 4,140,116	$ 3,465,407	$ 3,646,507	$ 3,579,566	$ 14,461,814	$ 10,691,481
Unrealized gain (loss) from marketable securities, net of tax	332,673	(1,127,362)	(338,553)	(380,161)	(197,034)	(90,165)	(1,133,242)	(667,361)
Comprehensive income	$ 4,563,997	$ 4,963,011	$ 3,801,563	$ 3,085,246	$ 3,449,473	$ 3,489,401	$ 13,328,572	$ 10,024,120