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Note 5 - Marketable Securities - Reconciliation of Marketable Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Sep. 30, 2024
--- | --- | ---
Amortized cost | $ 262,578 | $ 200,951
Gross unrealized losses | (94) | (387)
Gross unrealized gains | 238 | 52
Fair value | 262,722 | 200,616
US Treasury and Government [Member] |  |
Amortized cost | 245,691 | 118,159
Gross unrealized losses | (94) | (119)
Gross unrealized gains | 168 | 51
Fair value | 245,765 | 118,091
Certificates of Deposit [Member] |  |
Amortized cost | 1,640 | 5,212
Gross unrealized losses | 0 | (13)
Gross unrealized gains | 1 | 1
Fair value | 1,641 | 5,200
Corporate Debt Securities [Member] |  |
Amortized cost | 4,199 | 77,580
Gross unrealized losses | 0 | (255)
Gross unrealized gains | 0 | 0
Fair value | 4,199 | $ 77,325
US States and Political Subdivisions Debt Securities [Member] |  |
Amortized cost | 11,048 |
Gross unrealized losses | 0 |
Gross unrealized gains | 69 |
Fair value | $ 11,117 |

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