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Note 4 - Investments - Securities in a Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Sep. 30, 2024
--- | --- | ---
Fair value unrealized loss, less than 12 months | $ 37,773 | $ 19,719
Gross unrealized loss, less than 12 months | (69) | (39)
Fair value unrealized loss, greater than 12 months | 6,772 | 6,736
Gross unrealized loss, greater than 12 months | (237) | (262)
US Treasury Securities [Member] |  |
Fair value unrealized loss, less than 12 months | 37,773 | 19,719
Gross unrealized loss, less than 12 months | (69) | (39)
Fair value unrealized loss, greater than 12 months | 6,535 | 6,500
Gross unrealized loss, greater than 12 months | (226) | (250)
Certificates of Deposit [Member] |  |
Fair value unrealized loss, less than 12 months | 0 | 0
Gross unrealized loss, less than 12 months | 0 | 0
Fair value unrealized loss, greater than 12 months | 237 | 236
Gross unrealized loss, greater than 12 months | $ (11) | $ (12)

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