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Note 6 - Fair Value of Financial Instruments (Tables) | 12 Months Ended
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Sep. 30, 2025
Notes Tables |
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] |
|  | AS OF SEPTEMBER 30, 2025 |
|  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |  |  | Totals |
Recurring: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration |  | $ | — |  |  |  | — |  |  | $ | (2,540 | ) |  | $ | (2,540 | )
|  | AS OF SEPTEMBER 30, 2024 |
|  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |  |  | Totals |
Recurring: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term investments |  |  |  |  |  |  | . |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | — |  |  | $ | 21,849 |  |  | $ | — |  |  | $ | 21,849 |
U.S. treasury securities and securities of U.S. government-sponsored agency |  |  | — |  |  |  | 8,378 |  |  |  | — |  |  |  | 8,378 |
Total recurring |  | $ | — |  |  | $ | 30,227 |  |  | $ | — |  |  | $ | 30,227 |
Nonrecurring: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note receivable on sale of subsidiary |  | $ | — |  |  | $ | — |  |  | $ | 2,600 |  |  | $ | 2,600 |
Business Combination, Contingent Consideration [Table Text Block] |
Balance at October 1, 2024 |  | $ | — |
Contingent consideration pursuant to acquisition |  |  | 2,540 |
Fair value adjustments |  |  | — |
Payment of contingent consideration |  |  | — |
Balance at September 30, 2025 |  | $ | 2,540 |

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- Definition Tabular disclosure of contingent payment arrangements including the terms that will result in payment and the accounting treatment that will be followed if such contingencies occur, including the potential impact on earnings per share if contingencies are to be settled in common stock of the entity. The description also may include the period over which amounts are expected to be paid, and changes in the amount since the previous reporting period. This also includes contingent options and commitments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 805 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479581/805-30-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 805 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479581/805-30-50-1 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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