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Note 5 - Marketable Securities - Reconciliation of Marketable Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Sep. 30, 2023
--- | --- | ---
Amortized cost | $ 200,951 | $ 457,081
Gross unrealized losses | (387) | (6,870)
Gross unrealized gains | 52 | 0
Available-for-sale debt securities | 200,616 | 450,211
US Treasury and Government [Member] |  |
Amortized cost | 118,159 | 227,804
Gross unrealized losses | (119) | (2,573)
Gross unrealized gains | 51 | 0
Available-for-sale debt securities | 118,091 | 225,231
Certificates of Deposit [Member] |  |
Amortized cost | 5,212 | 8,122
Gross unrealized losses | (13) | (170)
Gross unrealized gains | 1 | 0
Available-for-sale debt securities | 5,200 | 7,952
Corporate Debt Securities [Member] |  |
Amortized cost | 77,580 | 221,155
Gross unrealized losses | (255) | (4,127)
Gross unrealized gains | 0 | 0
Available-for-sale debt securities | $ 77,325 | $ 217,028

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