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v3.23.3

Note 3 - Investments (Tables) | 12 Months Ended
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Sep. 30, 2023
Notes Tables |
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] |
|  | 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 |
|  | September 30, 2022 |
(In thousands) |  | Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Value |
Short-Term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Certificates of deposit |  | $ | 5,945 |  |  | $ | - |  |  | $ | 143 |  |  | $ | 5,802 |
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 |
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 |  | $ | 112,908 |  |  | $ | 131 |  |  | $ | 15,606 |  |  | $ | 608 |
Certificates of deposit |  |  | 245 |  |  |  | - |  |  |  | 7,870 |  |  |  | 147 |
Investment securities |  | $ | 113,153 |  |  | $ | 131 |  |  | $ | 23,476 |  |  | $ | 755 |
|  | 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 |
Investment securities |  | $ | 6,345 |  |  | $ | 176 |  |  | $ | 22,204 |  |  | $ | 1,414 |

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