Deferred Compensation Plan For Directors (Details) - USD ($)	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Deferred Compensation Plan For Directors [Line Items]
Number of shares credited to directors deferred fee account	232,091	177,678
Outstanding deferred balance	$ 1,768,151	$ 1,874,007
Total expenses charged to the company's results of operations	$ 234,466	$ 228,408	$ 272,491
Maximum [Member]
Deferred Compensation Plan For Directors [Line Items]
Period outside directors may elect to receive shares	10 years