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Note 4 - Investments (Tables) | 9 Months Ended
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Jun. 30, 2025
Notes Tables |
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] |
|  | June 30, 2025 |
(In thousands) |  | Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Value |
Short-Term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 83,411 |  |  | $ | 87 |  |  | $ | (140 | ) |  | $ | 83,358 |
Investment securities – short-term |  | $ | 83,411 |  |  | $ | 87 |  |  | $ | (140 | ) |  | $ | 83,358 |
Long-Term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 39,867 |  |  | $ | 60 |  |  | $ | - |  |  | $ | 39,927 |
Certificates of deposit |  |  | 248 |  |  |  | - |  |  |  | (7 | ) |  |  | 241 |
Investment securities – long-term |  | $ | 40,115 |  |  | $ | 60 |  |  | $ | (7 | ) |  | $ | 40,168 |
|  | September 30, 2024 |
(In thousands) |  | Amortized 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 |  |  | $ | 383 |  |  | $ | (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 |
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 |  | $ | 19,659 |  |  | $ | (29 | ) |  | $ | 5,166 |  |  | $ | (111 | )
Certificates of deposit |  |  | - |  |  |  | - |  |  |  | 241 |  |  |  | (7 | )
Investment securities |  | $ | 19,659 |  |  | $ | (29 | ) |  | $ | 5,407 |  |  | $ | (118 | )
|  | 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 | )

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