Condensed Consolidated Statements of Cash Flows (Unaudited) (Parenthetical) - USD ($)	Sep. 30, 2021	Sep. 30, 2020
Statement Of Cash Flows [Abstract]
Cash and cash equivalents	$ 91,542,566	$ 51,160,770
Restricted cash	83,257,569	79,302,009
Total cash, cash equivalents and restricted cash	$ 174,800,135	$ 130,462,779

Amount of cash and cash equivalents restricted as to withdrawal or usage, classified as current. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant