Quarterly report [Sections 13 or 15(d)]

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

v3.25.4
Note 4 - Investments - Available-for-sale Investments (Details) - USD ($)
$ in Thousands
Dec. 31, 2025
Sep. 30, 2025
Fair value $ 142,847 $ 144,306
Short-term US Treasury Securities [Member]    
Amortized cost 82,151 84,192
Unrealized gains 190 119
Unrealized losses (30) (70)
Fair value 82,311 84,241
Short-term Certificates of Deposit [Member]    
Amortized cost 248 248
Unrealized gains 0 0
Unrealized losses (3) (5)
Fair value 245 243
Short-term Investment [Member]    
Amortized cost 82,399 84,440
Unrealized gains 190 119
Unrealized losses (33) (75)
Fair value 82,556 84,484
US Treasury Securities [Member]    
Amortized cost   59,794
Unrealized gains   62
Unrealized losses   (34)
Fair value   59,822
Long-term Investment [Member]    
Amortized cost 60,244 59,794
Unrealized gains 47 62
Unrealized losses 0 (34)
Fair value 60,291 $ 59,822
Long-term US Treasury Securities [Member]    
Amortized cost 60,244  
Unrealized gains 47  
Unrealized losses 0  
Fair value $ 60,291