Investments (Tables)

12 Months Ended

Sep. 30, 2020

Held To Maturity Securities Classified [Abstract]

Summary of Short-term, Long-term Investments and Marketable Securities

The following tables summarize the Company’s short-term, long-term investments and marketable securities as of September 30, 2020 and September 30, 2019 by measurement category.

Held to Maturity	As of September 30, 2020
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Commercial notes (due within one year)	$	86,889,751	$	1,589,873	$	-		$	88,479,624
Commercial notes (due within one through three years)	$	137,486,883	$	4,573,964	$	(79,471	)	$	141,981,376
Total	$	224,376,634	$	6,163,837	$	(79,471	)	$	230,461,000
	As of September 30, 2019
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Commercial notes (due within one year)	$	36,899,894	$	222,584	$	-		$	37,122,478
Commercial notes (due within one through three years)	$	44,175,993	$	875,258	$	-		$	45,051,251
Total	$	81,075,887	$	1,097,842	$	-		$	82,173,729
Fair Value	As of September 30, 2020
	Amortized Cost		Realized Gains/(Losses)		Gross Unrealized Gains			Gross Unrealized Losses			Fair Value
Marketable securities	$	85,000,000	$	94,734	$	-		$	(75,015	)	$	85,019,719
Total	$	85,000,000	$	94,734	$	-		$	(75,015	)	$	85,019,719