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Note 6 - Fair Value Measurements - Unrealized Loss on Investments (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Sep. 30, 2023
--- | --- | ---
Unrealized loss position, less than 12 months, fair value | $ 3,118 | $ 684
Unrealized loss position, less than 12 months, gross unrealized loss | (3) | (2)
Unrealized loss position, more than 12 months, fair value | 0 | 496
Unrealized loss position, more than 12 months, gross unrealized loss | 0 | (8)
Unrealized loss position, fair value | 3,118 | 10
Unrealized loss position, gross unrealized loss | (3) | (1,180)
Short-term Securities | 3 | 1,180
Long-term Securities | (3,118) | (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 | 806 | 684
Unrealized loss position, less than 12 months, gross unrealized loss | 0 | (2)
Unrealized loss position, more than 12 months, fair value | 0 | 235
Unrealized loss position, more than 12 months, gross unrealized loss | 0 | (5)
Unrealized loss position, fair value | 806 | 919
Unrealized loss position, gross unrealized loss | 0 | (7)
Short-term Securities | (0) | 7
Long-term Securities | (806) | (919)
Corporate Debt Securities [Member] |  |
Unrealized loss position, less than 12 months, fair value | 2,312 | 0
Unrealized loss position, less than 12 months, gross unrealized loss | (3) | 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 | 2,312 | 261
Unrealized loss position, gross unrealized loss | (3) | (3)
Short-term Securities | 3 | 3
Long-term Securities | $ (2,312) | $ (261)

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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-7 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-5 + Details
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