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Note 4 - Income Taxes (Tables)
6 Months Ended
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%