Employee Benefit Plans (Schedule of Components of Net Periodic Cost) (Details) - USD ($)	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 691,602	$ 537,268
Interest cost	1,062,227	1,166,728
Expected return on plan assets	(1,836,623)	(1,549,437)
Recognized loss	455,744	158,599
Net periodic benefit cost	372,950	313,158
Postretirement Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	167,879	132,882
Interest cost	531,480	648,944
Expected return on plan assets	(550,394)	(547,218)
Recognized loss	237,371	123,805
Net periodic benefit cost	$ 386,336	$ 358,413