Deferred Compensation Plan For Directors (Details) - USD ($)	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Deferred Compensation Plan For Directors [Line Items]
Number of shares credited to directors deferred fee account	212,574	261,846
Outstanding deferred balance	$ 2,950,405	$ 3,459,909
Total expenses charged to the company's results of operations	$ 301,715	$ 358,658	$ 329,465
Maximum [Member]
Deferred Compensation Plan For Directors [Line Items]
Period outside directors may elect to receive shares	10 years