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Note 5 - Fair Value Measurements (Tables) | 9 Months Ended
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Jun. 30, 2023
Notes Tables |
Fair Value, Assets Measured on Recurring Basis [Table Text Block] |
|  | June 30, 2023 |
|  | Cost Basis |  |  | Unrealized Loss |  |  | Fair Value |  |  | Cash Equivalents |  |  | Short-term Securities |  |  | Long-term Securities |
Level 1: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 795 |  |  | $ | - |  |  | $ | 795 |  |  | $ | 795 |  |  | $ | - |  |  | $ | - |
Level 2: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Certificates of deposit |  |  | 302 |  |  |  | - |  |  |  | 302 |  |  |  | - |  |  |  | - |  |  |  | 302 |
Municipal securities |  |  | 2,747 |  |  |  | (12 | ) |  |  | 2,735 |  |  |  | - |  |  |  | 2,645 |  |  |  | 90 |
Corporate bonds |  |  | 911 |  |  |  | (7 | ) |  |  | 904 |  |  |  | - |  |  |  | 904 |  |  |  | - |
Subtotal |  |  | 3,960 |  |  |  | (19 | ) |  |  | 3,941 |  |  |  | - |  |  |  | 3,549 |  |  |  | 392 |
Total |  | $ | 4,755 |  |  | $ | (19 | ) |  | $ | 4,736 |  |  | $ | 795 |  |  | $ | 3,549 |  |  | $ | 392 |
|  | September 30, 2022 |
|  | Cost Basis |  |  | Unrealized Loss |  |  | Fair Value |  |  | Cash Equivalents |  |  | Short-term Securities |  |  | Long-term Securities |
Level 1: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 1,316 |  |  | $ | - |  |  | $ | 1,316 |  |  | $ | 1,316 |  |  | $ | - |  |  | $ | - |
Level 2: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Certificates of deposit |  |  | 800 |  |  |  | - |  |  |  | 800 |  |  |  | - |  |  |  | 498 |  |  |  | 302 |
Municipal securities |  |  | 4,066 |  |  |  | (65 | ) |  |  | 4,001 |  |  |  | - |  |  |  | 3,772 |  |  |  | 229 |
Corporate bonds |  |  | 2,402 |  |  |  | (25 | ) |  |  | 2,377 |  |  |  | - |  |  |  | 2,127 |  |  |  | 250 |
Subtotal |  |  | 7,268 |  |  |  | (90 | ) |  |  | 7,178 |  |  |  | - |  |  |  | 6,397 |  |  |  | 781 |
Total |  | $ | 8,584 |  |  | $ | (90 | ) |  | $ | 8,494 |  |  | $ | 1,316 |  |  | $ | 6,397 |  |  | $ | 781 |
Fair Value, Liabilities Measured on Recurring and Nonrecurring Basis [Table Text Block] |
Balance as of September 30, 2022 |  | $ | 680 |
Accretion |  |  | 36 |
Currency translation |  |  | 26 |
Balance as of June 30, 2023 |  | $ | 742 |

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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class 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://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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