Income Taxes (Reconciliation of Income Tax Expense Based on Federal Statutory Rate) (Details) - USD ($)	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Income Tax Disclosure [Abstract]
Income before income taxes	$ 13,870,194	$ 11,349,143
Corporate federal income tax rate	21.00%	21.00%
Income tax expense computed at the federal statutory rate	$ 2,912,741	$ 2,383,320
State income taxes, net of federal income tax benefit	647,685	537,545
Net amortization of excess deferred taxes on regulated operations	(162,228)	(212,896)
Tax benefit recognized on stock compensation	(114,984)	(96,499)
Other, net	22,446	39,261
Total income tax expense	$ 3,305,660	$ 2,650,731