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Note 4 - Marketable Securities - Reconciliation of Marketable Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Sep. 30, 2024
--- | --- | ---
Amortized cost | $ 113,580 | $ 200,951
Gross unrealized losses | (205) | (387)
Gross unrealized gains | 9 | 52
Fair value | 113,384 | 200,616
US Treasury and Government [Member] |  |
Amortized cost | 68,189 | 118,159
Gross unrealized losses | (83) | (119)
Gross unrealized gains | 9 | 51
Fair value | 68,115 | 118,091
Certificates of Deposit [Member] |  |
Amortized cost | 2,229 | 5,212
Gross unrealized losses | (6) | (13)
Gross unrealized gains | 0 | 1
Fair value | 2,223 | 5,200
Corporate Debt Securities [Member] |  |
Amortized cost | 42,634 | 77,580
Gross unrealized losses | (116) | (255)
Gross unrealized gains | 0 | 0
Fair value | 42,518 | $ 77,325
US States and Political Subdivisions Debt Securities [Member] |  |
Amortized cost | 528 |
Gross unrealized losses | 0 |
Gross unrealized gains | 0 |
Fair value | $ 528 |

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