Quarterly report [Sections 13 or 15(d)]

Note 4 - Investments - Available-for-sale Investments (Details)

v3.25.2
Note 4 - Investments - Available-for-sale Investments (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Sep. 30, 2024
Fair value $ 123,526 $ 139,330
Short-term US Treasury Securities [Member]    
Amortized cost 83,411 113,987
Unrealized gains 87 382
Unrealized losses (140) (45)
Fair value 83,358 114,324
Short-term Certificates of Deposit [Member]    
Amortized cost   500
Unrealized gains   1
Unrealized losses   0
Fair value   501
Short-term Investment [Member]    
Amortized cost 83,411 114,487
Unrealized gains 87 383
Unrealized losses (140) (45)
Fair value 83,358 114,825
US Treasury Securities [Member]    
Amortized cost   24,514
Unrealized gains   0
Unrealized losses   (245)
Fair value   24,269
Long-term US Treasury Securities [Member]    
Amortized cost 39,867  
Unrealized gains 60  
Unrealized losses 0  
Fair value 39,927  
Long-term Certificates of Deposit [Member]    
Amortized cost 248 248
Unrealized gains 0 0
Unrealized losses (7) (12)
Fair value 241 236
Long-term Investment [Member]    
Amortized cost 40,115 24,762
Unrealized gains 60 0
Unrealized losses (7) (257)
Fair value $ 40,168 $ 24,505