Deferred Compensation Plan For Directors (Details) - USD ($)	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Deferred Compensation Plan For Directors [Line Items]
Number of shares credited to directors deferred fee account	177,678	179,226
Outstanding deferred balance	$ 1,874,007	$ 2,555,781
Total expenses charged to the company's results of operations	$ 228,408	$ 272,491	$ 301,715
Maximum [Member]
Deferred Compensation Plan For Directors [Line Items]
Period outside directors may elect to receive shares	10 years