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Note 4 - Investments - Securities in a Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Sep. 30, 2023
--- | --- | ---
Fair value unrealized loss, less than 12 months | $ 19,719 | $ 113,153
Gross unrealized loss, less than 12 months | (39) | (131)
Fair value unrealized loss, greater than 12 months | 6,736 | 23,476
Gross unrealized loss, greater than 12 months | (262) | (755)
US Treasury Securities [Member] |  |
Fair value unrealized loss, less than 12 months | 19,719 | 112,908
Gross unrealized loss, less than 12 months | (39) | (131)
Fair value unrealized loss, greater than 12 months | 6,500 | 15,606
Gross unrealized loss, greater than 12 months | (250) | (608)
Certificates of Deposit [Member] |  |
Fair value unrealized loss, less than 12 months | 0 | 245
Gross unrealized loss, less than 12 months | 0 | 0
Fair value unrealized loss, greater than 12 months | 236 | 7,870
Gross unrealized loss, greater than 12 months |  | $ (147)
Gross unrealized loss, greater than 12 months | $ (12) |

X
- Definition Amount of accumulated unrealized loss (gain) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References No definition available. + Details
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