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Income Taxes (Reconciliation of Income Tax Expense Based on Federal Statutory Rate) (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019
Income Tax Disclosure [Abstract] |  |  |  |
Income before income taxes | $ 7,467,808 | $ 6,130,718 | $ 12,716,331 | $ 9,267,093
Corporate federal tax rate | 21.00% | 21.00% | 21.00% | 21.00%
Income tax expense computed at the federal statutory rate | $ 1,568,240 | $ 1,287,451 | $ 2,670,430 | $ 1,946,090
State income taxes, net of federal tax benefit | 338,631 | 290,481 | 588,668 | 441,070
Net amortization of excess deferred taxes on regulated operations | (86,208) | (86,208) | (124,332) | (172,417)
Other, net | (33,171) | (31,096) | (105,687) | (51,902)
Total income tax expense | $ 1,787,492 | $ 1,460,628 | $ 3,029,079 | $ 2,162,841
Effective tax rate | 23.90% | 23.80% | 23.80% | 23.30%

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