Significant Accounting Policies (Details) - USD ($)	3 Months Ended		12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Acquired Indefinite-lived Intangible Assets [Line Items]
Estimated useful live of intangible assets	10 years
Goodwill	$ 65,450,000		$ 67,144,000	$ 52,758,000
Goodwill impairment			0
Uncertain tax positions	0		$ 0
Income tax interest expense	0	$ 0
Income tax penalties expense	0	$ 0
Cash, FDIC insured amount	$ 250,000
Treasury stock (in shares)	0
Preferred shares authorized (in shares)	5,000,000
Preferred stock issued (in shares)	0
Employee Stock Option
Acquired Indefinite-lived Intangible Assets [Line Items]
Number of awards authorized for issuance (in shares)	0
Expiration term of share-based compensation plan	10 years
Minimum
Acquired Indefinite-lived Intangible Assets [Line Items]
Estimated useful of long-lived assets	3 years
Maximum
Acquired Indefinite-lived Intangible Assets [Line Items]
Estimated useful of long-lived assets	7 years