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Note 6 - Fair Value Measurements - Unrealized Loss on Investments (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Sep. 30, 2023
--- | --- | ---
Unrealized loss position, less than 12 months, fair value | $ 3,510 | $ 684
Unrealized loss position, less than 12 months, gross unrealized loss | (3) | (2)
Unrealized loss position, more than 12 months, fair value | 132 | 496
Unrealized loss position, more than 12 months, gross unrealized loss | (2) | (8)
Unrealized loss position, fair value | 3,642 | 10
Unrealized loss position, gross unrealized loss | (5) | (1,180)
Short-term Securities | 5 | 1,180
Long-term Securities | (3,642) | (10)
Certificates of Deposit [Member] |  |
Unrealized loss position, less than 12 months, fair value | 0 | 0
Unrealized loss position, less than 12 months, gross unrealized loss | 0 | 0
Unrealized loss position, more than 12 months, fair value | 0 | 0
Unrealized loss position, more than 12 months, gross unrealized loss | 0 | 0
Unrealized loss position, fair value | 0 | 0
Unrealized loss position, gross unrealized loss | 0 | 0
Short-term Securities | (0) | (0)
Long-term Securities | 0 | 0
US Treasury and Government [Member] |  |
Unrealized loss position, less than 12 months, fair value | 0 | 0
Unrealized loss position, less than 12 months, gross unrealized loss | 0 | 0
Unrealized loss position, more than 12 months, fair value | 0 | 0
Unrealized loss position, more than 12 months, gross unrealized loss | 0 | 0
Unrealized loss position, fair value | 0 | 0
Unrealized loss position, gross unrealized loss | 0 | 0
Short-term Securities | (0) | (0)
Long-term Securities | 0 | 0
US States and Political Subdivisions Debt Securities [Member] |  |
Unrealized loss position, less than 12 months, fair value | 628 | 684
Unrealized loss position, less than 12 months, gross unrealized loss | (1) | (2)
Unrealized loss position, more than 12 months, fair value | 132 | 235
Unrealized loss position, more than 12 months, gross unrealized loss | (2) | (5)
Unrealized loss position, fair value | 760 | 919
Unrealized loss position, gross unrealized loss | (3) | (7)
Short-term Securities | 3 | 7
Long-term Securities | (760) | (919)
Corporate Debt Securities [Member] |  |
Unrealized loss position, less than 12 months, fair value | 2,882 | 0
Unrealized loss position, less than 12 months, gross unrealized loss | (2) | 0
Unrealized loss position, more than 12 months, fair value | 0 | 261
Unrealized loss position, more than 12 months, gross unrealized loss | 0 | (3)
Unrealized loss position, fair value | 2,882 | 261
Unrealized loss position, gross unrealized loss | (2) | (3)
Short-term Securities | 2 | 3
Long-term Securities | $ (2,882) | $ (261)

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