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Note 4 - Income Taxes (Tables) | 6 Months Ended
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Mar. 31, 2022
Notes Tables |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] |
|  | Three Months Ended March 31, |  |  | Six Months Ended March 31, |
|  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
Effective tax rate |  |  | 26.1 | % |  |  | 25.2 | % |  |  | 26.6 | % |  |  | 24.8 | %
Effective tax rate - LLC impairment |  |  | 25.7 | % |  |  | - |  |  |  | 25.7 | % |  |  | - |
Effective tax rate excluding LLC impairment |  |  | 24.0 | % |  |  | 25.2 | % |  |  | 23.7 | % |  |  | 24.8 | %

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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 https://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 + Details
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