Gross unrealized holding losses and estimated fair value of marketable securities for which an allowance for credit losses has not been recorded (Details) - USD ($)	Sep. 30, 2023	Mar. 31, 2023
Schedule of Investments [Line Items]
Estimated Fair Value	$ 6,998,824	$ 37,084,628
Gross Unrealized Holding Losses	(86,868)	(590,967)
Estimated Fair Value	39,848,531	13,294,817
Gross Unrealized Holding Losses	(1,836,004)	(963,879)
Estimated Fair Value	46,847,355	50,379,445
Gross Unrealized Holding Losses	(1,922,872)	(1,554,846)
Corporate Bond Securities [Member]
Schedule of Investments [Line Items]
Estimated Fair Value	6,998,824	37,084,628
Gross Unrealized Holding Losses	(86,868)	(590,967)
Estimated Fair Value	39,848,531	13,294,817
Gross Unrealized Holding Losses	(1,836,004)	(963,879)
Estimated Fair Value	46,847,355	50,379,445
Gross Unrealized Holding Losses	$ (1,922,872)	$ (1,554,846)