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Note 4 - Investments - Securities in a Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Sep. 30, 2022
--- | --- | ---
Fair value unrealized loss, less than 12 months | $ 340 | $ 6,345
Gross unrealized loss, less than 12 months | 151 | 176
Fair value unrealized loss, greater than 12 months | 25,124 | 22,204
Gross unrealized loss, greater than 12 months | 982 | 1,414
US Treasury Securities [Member] |  |
Fair value unrealized loss, less than 12 months | 0 | 0
Gross unrealized loss, less than 12 months | 150 | 0
Fair value unrealized loss, greater than 12 months | 15,464 | 15,093
Gross unrealized loss, greater than 12 months | 738 | 1,085
Certificates of Deposit [Member] |  |
Fair value unrealized loss, less than 12 months | 340 | 6,345
Gross unrealized loss, less than 12 months | 1 | 176
Fair value unrealized loss, greater than 12 months | 9,660 | 7,111
Gross unrealized loss, greater than 12 months | $ 244 | $ 329

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