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Note 7 - Accumulated Other Comprehensive Loss (Tables)
12 Months Ended
Sep. 30, 2025
Notes Tables  
Comprehensive Income (Loss) [Table Text Block]
  

Unrealized Gains (Losses) on Available-for-Sale Securities

  

Foreign Currency Translation Adjustments

  

Total

 

Balance at October 1, 2023

 $(11) $(17,813) $(17,824)

Other comprehensive income

  67   13,500   13,567 

Balance at September 30, 2024

 $56   (4,313)  (4,257)

Other comprehensive loss

  (57)  (224)  (281)

Balance at September 30, 2025

 $(1) $(4,537) $(4,538)