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Note 3 - Investments (Tables) | 9 Months Ended
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Jun. 30, 2022
Notes Tables |
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] |
|  | June 30, 2022 |
(In thousands) |  | Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Value |
Short-Term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Certificates of deposit |  |  | 3,962 |  |  |  | 1 |  |  |  | 69 |  |  |  | 3,894 |
Investment securities – short-term |  | $ | 3,962 |  |  | $ | 1 |  |  | $ | 69 |  |  | $ | 3,894 |
Long-Term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S treasury securities |  | $ | 16,167 |  |  | $ | - |  |  | $ | 825 |  |  | $ | 15,342 |
Certificates of deposit |  |  | 10,000 |  |  |  | 1 |  |  |  | 348 |  |  |  | 9,652 |
Investment securities – long-term |  | $ | 26,167 |  |  | $ | 1 |  |  | $ | 1,173 |  |  | $ | 24,994 |
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 |  | $ | 15,342 |  |  | $ | 825 |  |  | $ | - |  |  | $ | - |
Certificates of deposit |  |  | 9,637 |  |  |  | 267 |  |  |  | 3,569 |  |  |  | 151 |
Investment securities |  | $ | 24,979 |  |  | $ | 1,092 |  |  | $ | 3,569 |  |  | $ | 151 |

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