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Note 4 - Investments (Tables) | 9 Months Ended
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Jun. 30, 2024
Notes Tables |
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] |
|  | June 30, 2024 |
(In thousands) |  | Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Value |
Short-Term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 98,105 |  |  | $ | - |  |  | $ | (155 | ) |  | $ | 97,950 |
Certificates of deposit |  |  | 247 |  |  |  | - |  |  |  | (2 | ) |  |  | 245 |
Investment securities – short-term |  | $ | 98,352 |  |  | $ | - |  |  | $ | (157 | ) |  | $ | 98,195 |
Long-Term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S Treasury securities |  | $ | 24,283 |  |  | $ | 8 |  |  | $ | (341 | ) |  | $ | 23,950 |
Certificates of deposit |  |  | 248 |  |  |  | - |  |  |  | (18 | ) |  |  | 230 |
Investment securities – long-term |  | $ | 24,531 |  |  | $ | 8 |  |  | $ | (359 | ) |  | $ | 24,180 |
|  | September 30, 2023 |
(In thousands) |  | Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Value |
Short-Term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S treasury securities |  | $ | 122,534 |  |  | $ | - |  |  | $ | (143 | ) |  | $ | 122,391 |
Certificates of deposit |  |  | 8,014 |  |  |  | - |  |  |  | (119 | ) |  |  | 7,895 |
Investment securities – short-term |  | $ | 130,548 |  |  | $ | - |  |  | $ | (262 | ) |  | $ | 130,286 |
Long-Term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S treasury securities |  | $ | 6,719 |  |  | $ | - |  |  | $ | (596 | ) |  | $ | 6,123 |
Certificates of deposit |  |  | 248 |  |  |  | - |  |  |  | (28 | ) |  |  | 220 |
Investment securities – long-term |  | $ | 6,967 |  |  | $ | - |  |  | $ | (624 | ) |  | $ | 6,343 |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block] |
|  | In Unrealized Loss Position For Less Than 12 Months |  |  | In Unrealized Loss Position For Greater Than 12 Months |
(In thousands) |  | Fair Value |  |  | Gross Unrealized Losses |  |  | Fair Value |  |  | Gross Unrealized Losses |
U.S treasury securities |  | $ | 96,508 |  |  | $ | (105 | ) |  | $ | 6,350 |  |  | $ | (391 | )
Certificates of deposit |  |  | - |  |  |  | - |  |  |  | 475 |  |  |  | (20 | )
Investment securities |  | $ | 96,508 |  |  | $ | (105 | ) |  | $ | 6,825 |  |  | $ | (411 | )
|  | In Unrealized Loss Position For Less Than 12 Months |  |  | In Unrealized Loss Position For Greater Than 12 Months |
(In thousands) |  | Fair Value |  |  | Gross Unrealized Losses |  |  | Fair Value |  |  | Gross Unrealized Losses |
U.S treasury securities |  | $ | 112,908 |  |  | $ | (131 | ) |  | $ | 15,606 |  |  | $ | (608 | )
Certificates of deposit |  |  | 245 |  |  |  | - |  |  |  | 7,870 |  |  |  | (147 | )
Investment securities |  | $ | 113,153 |  |  | $ | (131 | ) |  | $ | 23,476 |  |  | $ | (755 | )

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