Quarterly report pursuant to Section 13 or 15(d)

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

v3.24.0.1
Note 4 - Investments - Available-for-sale Investments (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Sep. 30, 2023
Fair value $ 134,857 $ 136,629
Short-term US Treasury Securities [Member]    
Amortized cost 123,932 122,534
Unrealized gains 30 0
Unrealized losses 13 143
Fair value 123,949 122,391
Short-term Certificates of Deposit [Member]    
Amortized cost 4,446 8,014
Unrealized gains 0 0
Unrealized losses 43 119
Fair value 4,403 7,895
Short-term Investment [Member]    
Amortized cost 128,378 130,548
Unrealized gains 30 0
Unrealized losses 56 262
Fair value 128,352 130,286
US Treasury Securities [Member]    
Amortized cost   6,719
Unrealized gains   0
Unrealized losses   596
Fair value   6,123
Long-term Certificates of Deposit [Member]    
Amortized cost 248 248
Unrealized gains 0 0
Unrealized losses 23 28
Fair value 225 220
Long-term Investment [Member]    
Amortized cost 6,976 6,967
Unrealized gains 0 0
Unrealized losses 471 624
Fair value 6,505 $ 6,343
Long-term US Treasury Securities [Member]    
Amortized cost 6,728  
Unrealized gains 0  
Unrealized losses 448  
Fair value $ 6,280