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Note 4 - Marketable Securities - Reconciliation of Marketable Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Sep. 30, 2024
--- | --- | ---
Amortized cost | $ 251,441 | $ 200,951
Gross unrealized losses | (132) | (387)
Gross unrealized gains | 169 | 52
Fair value | 251,478 | 200,616
US Treasury and Government [Member] |  |
Amortized cost | 214,926 | 118,159
Gross unrealized losses | (99) | (119)
Gross unrealized gains | 132 | 51
Fair value | 214,959 | 118,091
Certificates of Deposit [Member] |  |
Amortized cost | 1,975 | 5,212
Gross unrealized losses | (2) | (13)
Gross unrealized gains | 0 | 1
Fair value | 1,973 | 5,200
Corporate Debt Securities [Member] |  |
Amortized cost | 25,254 | 77,580
Gross unrealized losses | (31) | (255)
Gross unrealized gains | 0 | 0
Fair value | 25,223 | $ 77,325
US States and Political Subdivisions Debt Securities [Member] |  |
Amortized cost | 9,286 |
Gross unrealized losses | 0 |
Gross unrealized gains | 37 |
Fair value | $ 9,323 |

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