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Note 3 - Investments (Tables) | 12 Months Ended
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Sep. 30, 2024
Notes Tables |
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] |
|  | September 30, 2024 |
(In thousands) |  | Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Value |
Short-Term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S treasury securities |  | $ | 113,987 |  |  | $ | 382 |  |  | $ | (45 | ) |  | $ | 114,324 |
Certificates of deposit |  |  | 500 |  |  |  | 1 |  |  |  | - |  |  |  | 501 |
Investment securities – short-term |  | $ | 114,487 |  |  | $ | 384 |  |  | $ | (45 | ) |  | $ | 114,825 |
Long-Term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S treasury securities |  | $ | 24,514 |  |  | $ | - |  |  | $ | (245 | ) |  | $ | 24,269 |
Certificates of deposit |  |  | 248 |  |  |  | - |  |  |  | (12 | ) |  |  | 236 |
Investment securities – long-term |  | $ | 24,762 |  |  | $ | - |  |  | $ | (257 | ) |  | $ | 24,505 |
|  | September 30, 2023 |
(In thousands) |  | 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 |  | $ | 19,719 |  |  | $ | (39 | ) |  | $ | 6,500 |  |  | $ | (250 | )
Certificates of deposit |  |  | - |  |  |  | - |  |  |  | 236 |  |  |  | (12 | )
Investment securities |  | $ | 19,719 |  |  | $ | (39 | ) |  | $ | 6,736 |  |  | $ | (262 | )
|  | 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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