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Note 4 - Marketable Securities - Reconciliation of Marketable Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Sep. 30, 2024
--- | --- | ---
Amortized cost | $ 271,039 | $ 200,951
Gross unrealized losses | (140) | (387)
Gross unrealized gains | 86 | 52
Fair value | 270,985 | 200,616
US Treasury and Government [Member] |  |
Amortized cost | 255,091 | 118,159
Gross unrealized losses | (140) | (119)
Gross unrealized gains | 42 | 51
Fair value | 254,993 | 118,091
Certificates of Deposit [Member] |  |
Amortized cost | 1,234 | 5,212
Gross unrealized losses | 0 | (13)
Gross unrealized gains | 0 | 1
Fair value | 1,234 | 5,200
Corporate Debt Securities [Member] |  |
Amortized cost | 3,782 | 77,580
Gross unrealized losses | 0 | (255)
Gross unrealized gains | 0 | 0
Fair value | 3,782 | $ 77,325
US States and Political Subdivisions Debt Securities [Member] |  |
Amortized cost | 10,932 |
Gross unrealized losses | 0 |
Gross unrealized gains | 44 |
Fair value | $ 10,976 |

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