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Note 12 - Income Taxes (Tables)
6 Months Ended
Mar. 31, 2024
Notes Tables  
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
  

Three Months Ended March 31,

  

Six Months Ended March 31,

 
  

2024

  

2023

  

2024

  

2023

 

Effective tax rate

  23.1%  23.8%  23.5%  23.6%