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Note 4 - Investments - Securities in a Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Sep. 30, 2022
--- | --- | ---
Fair value unrealized loss, less than 12 months | $ 113,153 | $ 6,345
Gross unrealized loss, less than 12 months | 131 | 176
Fair value unrealized loss, greater than 12 months | 23,476 | 22,204
Gross unrealized loss, greater than 12 months | 755 | 1,414
US Treasury Securities [Member] |  |
Fair value unrealized loss, less than 12 months | 112,908 | 0
Gross unrealized loss, less than 12 months | 131 | 0
Fair value unrealized loss, greater than 12 months | 15,606 | 15,093
Gross unrealized loss, greater than 12 months | 608 | 1,085
Certificates of Deposit [Member] |  |
Fair value unrealized loss, less than 12 months | 245 | 6,345
Gross unrealized loss, less than 12 months | 0 | 176
Fair value unrealized loss, greater than 12 months | 7,870 | 7,111
Gross unrealized loss, greater than 12 months | $ 147 | $ 329

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