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Note 3 - Investments - Summary of Short-term Investments (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Sep. 30, 2022
--- | --- | ---
Investments, amortized cost | $ 14,932 | $ 909
Investments, unrealized gains | 4 | 0
Investments, unrealized losses | (15) | (15)
Investments, fair value | 14,921 | 894
Investments, unrealized losses | 15 | 15
Corporate Debt Securities [Member] |  |
Investments, amortized cost | 11,310 | 909
Investments, unrealized gains | 0 | 0
Investments, unrealized losses | (15) | (15)
Investments, fair value | 11,295 | 894
Investments, unrealized losses | 15 | $ 15
US Treasury and Government Short-Term Debt Securities [Member] |  |
Investments, amortized cost | 3,622 |
Investments, unrealized gains | 4 |
Investments, unrealized losses | 0 |
Investments, fair value | 3,626 |
Investments, unrealized losses | $ 0 |

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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + Details
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