Quarterly report pursuant to Section 13 or 15(d)

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

v3.24.1.u1
Note 4 - Investments - Available-for-sale Investments (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Sep. 30, 2023
Fair value $ 133,612 $ 136,629
Short-term US Treasury Securities [Member]    
Amortized cost 124,960 122,534
Unrealized gains 1 0
Unrealized losses (81) (143)
Fair value 124,880 122,391
Short-term Certificates of Deposit [Member]    
Amortized cost 2,221 8,014
Unrealized gains 0 0
Unrealized losses (12) (119)
Fair value 2,209 7,895
Short-term Investment [Member]    
Amortized cost 127,181 130,548
Unrealized gains 1 0
Unrealized losses (93) (262)
Fair value 127,089 130,286
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 (20) (28)
Fair value 228 220
Long-term Investment [Member]    
Amortized cost 6,985 6,967
Unrealized gains 0 0
Unrealized losses (462) (624)
Fair value 6,523 $ 6,343
Long-term US Treasury Securities [Member]    
Amortized cost 6,737  
Unrealized gains 0  
Unrealized losses (442)  
Fair value $ 6,295