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Note 6 - Accumulated Other Comprehensive Loss (Tables)
12 Months Ended
Sep. 30, 2024
Notes Tables  
Comprehensive Income (Loss) [Table Text Block]
  

Unrealized Losses on Available-for-Sale Securities

  

Foreign Currency Translation Adjustments

  

Total

 

Balance at October 1, 2022

 $(15) $(15,298) $(15,313)

Other comprehensive income (loss)

  4   (2,515)  (2,511)

Balance at September 30, 2023

 $(11)  (17,813)  (17,824)

Other comprehensive income

  67   13,500   13,567 

Balance at September 30, 2024

 $56  $(4,313) $(4,257)