Investments (Tables)

9 Months Ended

Jun. 30, 2020

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 June 30, 2020 and September 30, 2019.

	As of June 30, 2020
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Commercial notes (due within one year)	$	67,709,263	$	1,188,416	$	—	$	68,897,679
Commercial notes (due within one through three years)	$	177,529,881	$	5,845,177	$	(14,833)	$	183,360,225
Total	$	245,239,144	$	7,033,593	$	(14,833)	$	252,257,904‬

	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