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Note 4 - Income Taxes (Tables)
9 Months Ended
Jun. 30, 2023
Notes Tables  
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
  

Three Months Ended June 30,

  

Nine Months Ended June 30,

 
  

2023

  

2022

  

2023

  

2022

 

Effective tax rate

  23.8%  22.0%  23.7%  26.7%

Effective tax rate - LLC impairment

           25.7%

Effective tax rate excluding LLC impairment

  23.8%  22.0%  23.7%  23.6%