Summary of Significant Accounting Policies (Components of Accumulated Comprehensive Income (Loss)) (Details) - USD ($)	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Increase (Decrease) in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ 83,096,392	$ 79,583,112
Other comprehensive income (loss)	(959,027)	(1,617,249)
Ending balance	88,887,977	83,096,392
Interest Rate Swaps
Increase (Decrease) in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(664,137)	230,624
Other comprehensive income (loss)	(987,076)	(894,761)
Ending balance	(1,651,213)	(664,137)
Defined Benefit Plans
Increase (Decrease) in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(1,824,780)	(1,102,292)
Other comprehensive income (loss)	28,049	(722,488)
Ending balance	(1,796,731)	(1,824,780)
Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(2,488,917)	(871,668)
Other comprehensive income (loss)	(959,027)	(1,617,249)
Ending balance	$ (3,447,944)	$ (2,488,917)