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Note 4 - Investments (Tables) | 3 Months Ended
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Dec. 31, 2023
Notes Tables |
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] |
|  | December 31, 2023 |
(In thousands) |  | Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Value |
Short-Term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 123,932 |  |  | $ | 30 |  |  | $ | 13 |  |  | $ | 123,949 |
Certificates of deposit |  |  | 4,446 |  |  |  | - |  |  |  | 43 |  |  |  | 4,403 |
Investment securities – short-term |  | $ | 128,378 |  |  | $ | 30 |  |  | $ | 56 |  |  | $ | 128,352 |
Long-Term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S Treasury securities |  | $ | 6,728 |  |  | $ | - |  |  | $ | 448 |  |  | $ | 6,280 |
Certificates of deposit |  |  | 248 |  |  |  | - |  |  |  | 23 |  |  |  | 225 |
Investment securities – long-term |  | $ | 6,976 |  |  | $ | - |  |  | $ | 471 |  |  | $ | 6,505 |
|  | 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 |  | $ | 38,207 |  |  | $ | 50 |  |  | $ | 6,280 |  |  | $ | 444 |
Certificates of deposit |  |  | 245 |  |  |  | - |  |  |  | 4,384 |  |  |  | 65 |
Investment securities |  | $ | 38,452 |  |  | $ | 50 |  |  | $ | 10,664 |  |  | $ | 509 |
|  | 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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