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Note 3 - Investments - Available-for-sale Investments (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 09, 2022
--- | --- | --- | ---
Fair value | $ 136,629 | $ 28,549 |
Short-term Certificates of Deposit [Member] |  |  |
Amortized cost | 8,014 | 5,945 |
Unrealized gains | 0 | 0 |
Unrealized losses | 119 | 143 |
Fair value | 7,895 |  | $ 5,802
Short-term US Treasury Securities [Member] |  |  |
Amortized cost | 122,534 |  |
Unrealized gains | 0 |  |
Unrealized losses | 143 |  |
Fair value | 122,391 |  |
Short-term Investment [Member] |  |  |
Amortized cost | 130,548 | 5,945 |
Unrealized gains | 0 | 0 |
Unrealized losses | 262 | 143 |
Fair value | 130,286 |  | 5,802
US Treasury Securities [Member] |  |  |
Amortized cost |  | 16,178 |
Unrealized gains |  | 0 |
Unrealized losses |  | 1,085 |
Fair value |  |  | 15,093
Long-term Certificates of Deposit [Member] |  |  |
Amortized cost | 248 | 8,016 |
Unrealized gains | 0 | 0 |
Unrealized losses | 28 | 362 |
Fair value | 220 |  | 7,654
Long-term Investment [Member] |  |  |
Amortized cost | 6,967 | 24,194 |
Unrealized gains | 0 | 0 |
Unrealized losses | 624 | $ 1,447 |
Fair value | 6,343 |  | $ 22,747
Long-term US Treasury Securities [Member] |  |  |
Amortized cost | 6,719 |  |
Unrealized gains | 0 |  |
Unrealized losses | 596 |  |
Fair value | $ 6,123 |  |

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- Definition Amount, before tax, of unrealized gain 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 (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + Details
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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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