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Note 4 - Investments (Tables) | 9 Months Ended
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Jun. 30, 2023
Notes Tables |
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] |
|  | June 30, 2023 |
(In thousands) |  | Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Value |
Short-Term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 121,458 |  |  | $ | - |  |  | $ | 278 |  |  | $ | 121,180 |
Certificates of deposit |  |  | 9,750 |  |  |  | - |  |  |  | 204 |  |  |  | 9,546 |
Total investment securities – short-term |  | $ | 131,208 |  |  | $ | - |  |  | $ | 482 |  |  | $ | 130,726 |
Long-Term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S Treasury securities |  | $ | 6,711 |  |  | $ | - |  |  | $ | 610 |  |  | $ | 6,101 |
Certificates of deposit |  |  | 495 |  |  |  | - |  |  |  | 40 |  |  |  | 455 |
Total investment securities – long-term |  | $ | 7,206 |  |  | $ | - |  |  | $ | 650 |  |  | $ | 6,556 |
|  | September 30, 2022 |
(In thousands) |  | Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Value |
Short-Term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Certificates of deposit |  | $ | 5,945 |  |  | $ | - |  |  | $ | 143 |  |  | $ | 5,802 |
Total investment securities – short-term |  | $ | 5,945 |  |  | $ | - |  |  | $ | 143 |  |  | $ | 5,802 |
Long-Term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S Treasury securities |  |  | 16,178 |  |  |  | - |  |  |  | 1,085 |  |  |  | 15,093 |
Certificates of deposit |  |  | 8,016 |  |  |  | - |  |  |  | 362 |  |  |  | 7,654 |
Total investment securities – long-term |  | $ | 24,194 |  |  | $ | - |  |  | $ | 1,447 |  |  | $ | 22,747 |
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 |  | $ | - |  |  | $ | 150 |  |  | $ | 15,464 |  |  | $ | 738 |
Certificates of deposit |  |  | 340 |  |  |  | 1 |  |  |  | 9,660 |  |  |  | 244 |
Total investment securities |  | $ | 340 |  |  | $ | 151 |  |  | $ | 25,124 |  |  | $ | 982 |
|  | 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 |  | $ | - |  |  | $ | - |  |  | $ | 15,093 |  |  | $ | 1,085 |
Certificates of deposit |  |  | 6,345 |  |  |  | 176 |  |  |  | 7,111 |  |  |  | 329 |
Total investment securities |  | $ | 6,345 |  |  | $ | 176 |  |  | $ | 22,204 |  |  | $ | 1,414 |

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