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Income Taxes (Tables) | 6 Months Ended
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Mar. 31, 2020
Income Tax Disclosure [Abstract] |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] | A reconciliation of income tax expense from applying the federal statutory rates in effect for each period to total income tax expense is presented below:
| Three Months Ended March 31, |  | Six Months Ended March 31,
| 2020 |  | 2019 |  | 2020 |  | 2019
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 | 23.9 | % |  | 23.8 | % |  | 23.8 | % |  | 23.3 | %

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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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