Deferred Compensation Plan For Directors (Details) - USD ($)	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Deferred Compensation Plan For Directors [Line Items]
Number of shares credited to directors deferred fee account	179,226	212,574
Outstanding deferred balance	$ 2,555,781	$ 2,950,405
Total expenses charged to the company's results of operations	$ 272,491	$ 301,715	$ 358,658
Maximum [Member]
Deferred Compensation Plan For Directors [Line Items]
Period outside directors may elect to receive shares	10 years