Investments (Tables)

12 Months Ended

Sep. 30, 2019

Held To Maturity Securities Classified [Abstract]

Summary of Short-term and Long-term Investments

The following tables summarize the Company’s short-term and long-term investments as of September 30, 2019, and September 30, 2018.

	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 three years)	$	44,175,993	$	875,258	$	—	$	45,051,251
Total	$	81,075,887	$	1,097,842	$	—	$	82,173,729

	As of September 30, 2018
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Commercial notes (due within one year)	$	46,400,176	$	—	$	(429,050	)	$	45,971,126
Commercial notes (due within three years)	$	—	$	—	$	—		$	—
Total	$	46,400,176	$	—	$	(429,050	)	$	45,971,126