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Note 4 - Investments - Securities in a Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Sep. 30, 2024
--- | --- | ---
Fair value unrealized loss, less than 12 months | $ 19,669 | $ 19,719
Gross unrealized loss, less than 12 months | (43) | (39)
Fair value unrealized loss, greater than 12 months | 6,852 | 6,736
Gross unrealized loss, greater than 12 months | (165) | (262)
US Treasury Securities [Member] |  |
Fair value unrealized loss, less than 12 months | 19,669 | 19,719
Gross unrealized loss, less than 12 months | (43) | (39)
Fair value unrealized loss, greater than 12 months | 6,613 | 6,500
Gross unrealized loss, greater than 12 months | (156) | (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 | 239 | 236
Gross unrealized loss, greater than 12 months | $ (9) | $ (12)

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